This fixes FS 1147.  Thanks to Elias Pipping for the patch.

[[Imported from SVN: r6819]]

fix typo in ax_boost_base (thanks to Bård Skaflestad for the patch)

[[Imported from SVN: r6818]]

Patch contributed by Matthias Wohlmuth

[[Imported from SVN: r6816]]

details.

[[Imported from SVN: r6812]]

[[Imported from SVN: r6811]]

[[Imported from SVN: r6809]]

assignment.

[[Imported from SVN: r6802]]

[[Imported from SVN: r6801]]

only warn about disabled duneweb if the user tried to use duneweb

[[Imported from SVN: r6800]]

disable dune-web if wml or doxygen is missing
give a warning when diabling dune-web

[[Imported from SVN: r6799]]

[[Imported from SVN: r6798]]

dune-geometry.

[[Imported from SVN: r6796]]

[[Imported from SVN: r6795]]

mpitraits.hh forward declares std::pair, which is illegal by the standard, and clang stumbles over that.
Fixes FS#1121.
(Thanks to Steffen Müting for the patch)

[[Imported from SVN: r6791]]

[[Imported from SVN: r6788]]

With the exception of mpicollectivecommunication.hh
and propertymap.hh, which I didn't understand.

[[Imported from SVN: r6784]]

[[Imported from SVN: r6774]]

[[Imported from SVN: r6772]]

In particular, the search gets faster _because of_ the use of ls,
not _despite_ of it.

[[Imported from SVN: r6769]]

Add DUNE_DEPRECATED_MSG() to the predefined macros for Doxygen, otherwise it gets confused and messes up with \copydoc. 

[[Imported from SVN: r6767]]

[[Imported from SVN: r6762]]

avoid unused variable warnings/error in nullptr test
patch by Matthias Wohlmuth

[[Imported from SVN: r6760]]

always install doxygen files, even if we didn't generate them

[[Imported from SVN: r6759]]

- fix 1. part of FS#1116

[[Imported from SVN: r6757]]

cleanup fix of fs#1114

[[Imported from SVN: r6752]]

[[Imported from SVN: r6751]]

- canonicalize DUNE_CONTROL_PATH
- sort/uniq DUNE_CONTROL_PATH
- fix FS#1114

[[Imported from SVN: r6750]]

- use pkg-config to destinguish between installed and source modules
- fix FS#1100

[[Imported from SVN: r6749]]

${libdir}/x86_64-linux-gnu/pkgconfig/.
Honor this setting when checking whether the module is installed.

Fixes flyspray 1100 for me.

[[Imported from SVN: r6746]]

- Remove unnecessary path to control file (It was needed for building
  installed modules which we do not do any more
- Test for ../../pkgconfig/$modname.pc to decide whether a module is 
  installed or not. Fixes flyspray 1100.

[[Imported from SVN: r6738]]

[[Imported from SVN: r6737]]

  do exist, as they are actually one file for installed modules.)
- Only build modules that are not installed
- Store relative path of CONTROL file and use it during running
  commands (on second thought I am not sure whether this is really
  needed).

Fixes flyspray 1112.
Please check whether flyspray 1100 is also resolved.

After review this should definitely be merged into the release branch.

[[Imported from SVN: r6736]]

This fixes FS 946.

[[Imported from SVN: r6734]]

- make sure that the module is not a local one before checking if it
  is installed
- fix FS#1100

[[Imported from SVN: r6728]]

according to the standard std::pair is a struct

[[Imported from SVN: r6727]]

No clue what that patch was supposed to due,
but it even slipped into dune 2.1.

[[Imported from SVN: r6716]]

Backported from Martin's development branch.

[[Imported from SVN: r6713]]

Backported from Martin's development branch,
minus some whitespace changes.  Thanks.

[[Imported from SVN: r6712]]

[[Imported from SVN: r6709]]

[[Imported from SVN: r6705]]