Merge branch 'dune_add_library-OBJECT-SOURCES' into 'master'

ref:core/dune-common Previously the OBJECT path of dune_add_library would only
use the unparsed arguments. Source files specified via the SOURCES option were
ignored.

See merge request [!707]

  [!707]: gitlab.dune-project.org/core/dune-common/merge_requests/707

Previously the `OBJECT` path of `dune_add_library` would only use the
unparsed arguments.  Source files specified via the `SOURCES` option
were ignored.

Merge branch 'document-skipversioncheck' into 'master'

ref:core/dune-common Apparently, this option has been around since 2009, but
somehow it never made it into the man page and the output of -h.

See merge request [!706]

  [!706]: gitlab.dune-project.org/core/dune-common/merge_requests/706

Apparently, this option has been around since 2009, but somehow
it never made it into the man page and the output of -h.

Merge branch 'issue/quadmath_improvements' into 'master'

ref:core/dune-common

### Summary

Add missing AddQuadMathFlags.cmake, clean up the implementation of
numeric_limits, and add a specialization of the pow() function with integer
exponents.

### Motivation

Addresses some issues of [#127], e.g. the missing add_quadmath_flags cmake
function. Additionally the numeric_limits are cleaned up, following now some
the boost::multiprecision implementation.

While benchmarking some quadrature rules with Float128 I found out, that the
`pow(Float128, int)` implementation is very slow, since it calls the
`powq(Float128, Float128)` function. There was no specialization for integer
exponents. This is added now and is much faster. The implementation is derived
from boost::multiprecision library.

### TODO

-   [x] Add reference to boost implementation

Closes [#127] Closes [#129]

See merge request [!566]

  [#127]: gitlab.dune-project.org/NoneNone/issues/127
  [#129]: gitlab.dune-project.org/NoneNone/issues/129
  [!566]: gitlab.dune-project.org/core/dune-common/merge_requests/566


Closes #129 and #127

Merge branch 'fix-typos' into 'master'

See merge request [!704]

  [!704]: Nonecore/dune-common/merge_requests/704

'configure' is an old alias for 'cmake', back from the
good old AutoTools days.

Merge branch 'feature/make-vectors-more-like-containers' into 'master'

ref:core/dune-common This merge request makes dense vectors look a little bit
more like standard containers by adding front(), back() and empty() member
functions.

For dense vectors where the implementation uses a contiguous array, a data()
member function is also provided.

See merge request [!700]

  [!700]: gitlab.dune-project.org/core/dune-common/merge_requests/700

Merge branch 'dunecontrol-printdeps-pretty-module-name' into 'master'

See merge request [!702]

  [!702]: Nonecore/dune-common/merge_requests/702

Merge branch 'cleanup/delete-unwanted-member-functions' into 'master'

See merge request [!701]

  [!701]: Nonecore/dune-common/merge_requests/701

Merge branch 'bug/make-inkscape-run-headless-on-macos' into 'master'

ref:core/dune-common We run inkscape in headless mode to convert a number of
SVG files. On macOS, inkscape unfortunately still wants to start the X server
and open a window in this mode. This patch adds option "-z" to override that
behavior.

See merge request [!695]

  [!695]: gitlab.dune-project.org/core/dune-common/merge_requests/695

Merge branch 'feature/support-relative-symlink-creation' into 'master'

ref:core/dune-common This patch adds a new option DUNE_SYMLINK_RELATIVE_LINKS
that creates relative instead of absolute symlinks.

See merge request [!694]

  [!694]: gitlab.dune-project.org/core/dune-common/merge_requests/694

We run inkscape in headless mode to convert a number of SVG files. On macOS,
inkscape unfortunately still wants to start the X server and open a window in
this mode. This patch adds option "-z" to override that behavior.

This patch adds a new option DUNE_SYMLINK_RELATIVE_LINKS that creates relative
instead of absolute symlinks.

[!693] Add a method "exists" to ParallelIndexSet that checks if a global id is already in the index set.

Merge branch 'addexistsonparallelindexset' into 'master'

See merge request [!693]

  [!693]: Nonecore/dune-common/merge_requests/693

Merge branch 'bugfix/python-version-detector' into 'master'

ref:core/dune-common This MR fixes the mixup of python version detection. As
in the system cmake script the newest python version needs to be listed first.

See merge request [!692]

  [!692]: gitlab.dune-project.org/core/dune-common/merge_requests/692

Merge branch 'FieldMatrix-and-FieldVector-trivially-copyable-types' into 'master'

ref:core/dune-common Closes: [#168], [#169]

See merge request [!688]

  [#168]: gitlab.dune-project.org/NoneNone/issues/168
  [#169]: gitlab.dune-project.org/NoneNone/issues/169
  [!688]: gitlab.dune-project.org/core/dune-common/merge_requests/688


Closes #169 and #168

Merge branch 'feature/proper-union-activation' into 'master'

ref:core/dune-common

-   Members of a union need to be activated by calling a constructor (e.g.
    using placement new)
-   This allows to also delete the move-assignment operators such that we can
    now better protect the internal classes against misuse.

See merge request [!691]

  [!691]: gitlab.dune-project.org/core/dune-common/merge_requests/691

* Members of a union need to be activated by calling a constructor
  (e.g. using placement new)
* This allows to also delete the move-assignment operators such
  that we can now better protect the internal classes against misuse.

Merge branch 'feature/improve-std-variant' into 'master'

ref:core/dune-common This fixes several bugs/incompatibilities and makes the
code (hopefully) a little more robust and better to understand. It's the
result of the discussion with @lasse.hinrichsen.

This should also fix the problem in [dune-localfunctions!113]

-   Remove explicit Buffer class and use aligned_storage directly
-   Use a single TypeStorage implementation for all types
-   Rename variant_union_ to \`VariadicUnion\*
-   Clean up interfaces and implementation of TypeStorage and VariadicUnion
    -   Only allow (default) construction of empty objects
    -   Only allow move assignment. The rhs must be empty, but this can
        neither be checked statically nor dynamically.
    -   All construction and assignment is done using special construct() and
        assign() methods.
    -   Destruction is only done using the destruct() method.
-   Impl::variant_ does no longer rely on standard construction and assignment
    operators (despite the two exceptions) but uses the new special methods

This fixes several bugs and incompatibilities of the old implementation:

-   Non-trivial types are no longer copied binary.
-   Destructors are now called properly.
-   Copy/move assignment now decays to copy/move assignment of the stored
    value if it already has the target type.
-   Unnecessary copies are avoided.

See merge request [!689]

  [dune-localfunctions!113]: gitlab.dune-project.org/core/dune-localfunctions/merge_requests/113
  [!689]: gitlab.dune-project.org/core/dune-common/merge_requests/689

* Remove explicit Buffer class and use aligned_storage directly
* Use a single TypeStorage implementation for all types
* Rename variant_union_ to VariadicUnion
* Clean up interfaces and implementation of TypeStorage and VariadicUnion
  * Only allow (default) construction of empty objects
  * Only allow move assignment. The rhs must be empty, but
    this can neither be checked statically nor dynamically.
  * All construction and assignment is done using special
    construct() and assign() methods.
  * Destruction is only done using the destruct() method.
* Impl::variant_ does no longer rely on standard construction
  and assignment operators (despite the two exceptions) but
  uses the new special methods

This fixes several bugs and incompatibilities of the old
implementation:

* Non-trivial types are no longer copied binary.
* Destructors are now called properly.
* Copy/move assignment now decays to copy/move
  assignment of the stored value if it already
  has the target type

The defaulted copy constructor causes an internal compiler error with
GCC 5.4 as shipped with Ubuntu 16.04.

Closes: #169

Closes: #168

Merge branch 'deprecate-make_unique-fallback' into 'master'

ref:core/dune-common Closes: [#97]

See merge request [!686]

  [#97]: gitlab.dune-project.org/NoneNone/issues/97
  [!686]: gitlab.dune-project.org/core/dune-common/merge_requests/686


Closes #97

Merge branch 'stop-using-binary_function' into 'master'

See merge request [!685]

  [!685]: Nonecore/dune-common/merge_requests/685


Closes #167