Ensure `DDD_GID` is at least 64 bits wide

a0cf9c01 increased `MAX_PROCBITS_IN_GID`
from 9 to 24.  As an `unsigned long` is only 32 bits wide on common
32 bit architectures, this left only 8 bits instead of the intended
40 bits (on 64 bit architectures) for objects.

This patch makes sure the `DDD_GID` type is at least 64 bits by using
the `std::uint_least64_t` type.  It should fix the build failure on, for
example, [i386] and [PowerPC].

  [i386]: https://buildd.debian.org/status/fetch.php?pkg=dune-grid&arch=i386&ver=2.5.0%7Erc1-1&stamp=1480684720
  [PowerPC]: https://buildd.debian.org/status/fetch.php?pkg=dune-grid&arch=s390x&ver=2.5.0%7Erc1-1&stamp=1480658113

See merge request !38

a0cf9c01 increased `MAX_PROCBITS_IN_GID`
from 9 to 24.  As an `unsigned long` is only 32 bits wide on common
32 bit architectures, this left only 8 bits instead of the intended
40 bits (on 64 bit architectures) for objects.

This patch makes sure the `DDD_GID` type is at least 64 bits by using
the `std::uint_least64_t` type.  It should fix the build failure on, for
example, [i386] and [PowerPC].

  [i386]: https://buildd.debian.org/status/fetch.php?pkg=dune-grid&arch=i386&ver=2.5.0%7Erc1-1&stamp=1480684720
  [PowerPC]: https://buildd.debian.org/status/fetch.php?pkg=dune-grid&arch=s390x&ver=2.5.0%7Erc1-1&stamp=1480658113

Remove grid smoothing

See merge request !37

It was only used for grid smoothing which was removed in the previous commit.

The declarations were added in 1ab1a104,
but there seems to never have been an implementation.

Correct typo [ci skip]

See merge request !36

Address various compiler warnings

At least the missing `return` statements can lead to undefined behavior, and in particular to crashes with clang.

See merge request !31

This silences a large number of compiler warnings from clang:

    warning: format specifies type 'unsigned int' but the argument
    has type 'DDD_GID' (aka 'unsigned long') [-Wformat]

A few more format string corrections for pointers are also included.

This is more consistent with other format strings.

This addresses the following compiler warning from clang:

    parallel/dddif/lb.cc:390:22:
    warning: '&&' within '||' [-Wlogical-op-parentheses]

    parallel/dddif/lb.cc:391:20:
    warning: '&&' within '||' [-Wlogical-op-parentheses]

As noted in the description, this is not a good idea on systems with
virtual memory.

This also addresses the following compiler warning from clang:

    parallel/dddif/memmgr.cc:871:15: warning:
    unused function 'DetectAllocatableMemory'

Use <dev/ugdevices.h> instead of "ugdevices.h"

Including dev caused trouble.
This addresses #13 for dev.

See merge request !34

Including dev caused trouble.
This addresses #13 for dev.

Remove another left-over occurrence of FOR_DUNE



See merge request !33

Remove dead code behind _SCHALE_X_ macro

The documentation says 'DG local refinement hack', and it hasn't been
enabled for as long as we have been using Dune.  So away with it!

See merge request !32

The documentation says 'DG local refinement hack', and it hasn't been
enabled for as long as we have been using Dune.  So away with it!

This addresses the following compiler warnings from clang:

    gm/dlmgr.t:258:62: warning: format specifies type 'unsigned int'
    but the argument has type 'NODE *' (aka 'UG::D3::node *') [-Wformat]
      (for `Object`)

    gm/dlmgr.t:442:68: warning: format specifies type 'unsigned int'
    but the argument has type 'NODE *' (aka 'UG::D3::node *') [-Wformat]
      (for `Object`)

    gm/dlmgr.t:442:75: warning: format specifies type 'unsigned int'
    but the argument has type 'NODE *' (aka 'UG::D3::node *') [-Wformat]
      (for `After`)

    gm/dlmgr.t:465:61: warning: format specifies type 'unsigned int'
    but the argument has type 'NODE *' (aka 'UG::D3::node *') [-Wformat]
      (for `Object`)

This addresses the following compiler warnings from clang:

    gm/dlmgr.t:431:6: warning:
    unused variable 'listpartnext' [-Wunused-variable]

    gm/dlmgr.t:430:6: warning:
    unused variable 'listpartprev' [-Wunused-variable]

This addresses the following compiler warning from clang:

  warning: 'register' storage class specifier is deprecated
  and incompatible with C++1z [-Wdeprecated-register]

This addresses several compiler warnings of the form

  warning: control may reach end of non-void function [-Wreturn-type]

and

  warning: control reaches end of non-void function [-Wreturn-type]

Add missing return statements

This avoids undefined behaviour. However, I have no idea,
if `0` is a proper value to return.

Closes #14

See merge request !29

This avoids undefined behaviour. However, I have no idea,
if `0` is a proper value to return.

Fix/remove include directories

See merge request !26

It caused -Wmissing-include-dirs warnings in dune-uggrid

Update test environments

- No longer test with clang 3.5.
- Add clang 3.8 from Debian 8 + backports
- Add gcc 5.4 + clang 3.8 from Ubuntu 16.04 LTS.
- Use `duneci-standard-test`

See merge request !28

- No longer test with clang 3.5.
- Add clang 3.8 from Debian 8 + backports
- Add gcc 5.4 + clang 3.8 from Ubuntu 16.04 LTS.
- Use `duneci-standard-test`

[cmake] Remove checks for X11 (xlib)



See merge request !27

Remove more unused parts

This merge request removes a few more commands and some parts of `np/*`.

See merge request !24

DUNE uses the `newformat` command, but calls `CreateFormatCmd` (part of
`formats.h`) directly.

DDD's Fortran interface was already removed in
b49fe96e. This file was just missed.

It is not used anywhere.