* Libraries are in .../lib, not .../libs.
* When using AC_CHECK_LIB, the -L option has to be put into LDFLAGS
  temporarily.  Use DUNE_CHECK_LIB_EXT, which does that automatically.
* Clear the output variables if GMP was not found.
* Put result into ALL_PKG_* instead of DUNE_PKG_*

[[Imported from SVN: r5852]]

useful for other peaple as well, move it from dune-localfunction to
dune-common.

[[Imported from SVN: r5851]]

put -L into LIBS.
Add to ALL_PKG_*

[[Imported from SVN: r5850]]

[[Imported from SVN: r5847]]

that automatically.

[[Imported from SVN: r5845]]

fix "FS#711 - GRIDDIM not in ALL_PKG_CPPFLAGS"

[[Imported from SVN: r5841]]

[[Imported from SVN: r5840]]

DUNE_COMMON_CHECKS macro into the DUNE_MPI macro.

Also add the GL flags to the ALL_PKG_* variables.

[[Imported from SVN: r5839]]

[[Imported from SVN: r5838]]

[[Imported from SVN: r5837]]

[[Imported from SVN: r5836]]

[[Imported from SVN: r5835]]

libs to the ALL_PKG_* family of variables and DUNE_ADD_MODULE_DEPS to add
flags and libs to the DUNE_* family of variables and the modules variables.
Use those macros in DUNE_CHECK_MODULES.

[[Imported from SVN: r5834]]

Rewrite the DUNE_CHECK_LIB_EXT macro:

 * Essentially copy and adapt the definition of AC_CHECK_LIB.  This should
   make sure the two macros behave the same even in corner cases (except for
   the added functionality, of course).

 * Properly document what exactly is allowed in the arguments.

[[Imported from SVN: r5833]]

[[Imported from SVN: r5832]]

[[Imported from SVN: r5831]]

 * Essentially copy and adapt the definition of AC_CHECK_LIB.  This should
   make sure the two macros behave the same even in corner cases (except for
   the added functionality, of course).

 * Properly document what exactly is allowed in the arguments.

Parse arguments to DUNE_CHECK_LIBS_EXT properly in parmetis.  This avoids
expansions like 'LDFLAGS="$LDFLAGS -L"$PARMETISLIBPATH""'.

[[Imported from SVN: r5830]]

Improve the module's m4 file generated by duneproject

[[Imported from SVN: r5828]]

[[Imported from SVN: r5827]]

[[Imported from SVN: r5824]]

- autoconf documentation states that ifelse is remapped to m4_if
- the library check is AC_CHECK_LIB

I hope this is what was intended

@Christian: Could you please verify this?

[[Imported from SVN: r5823]]

[[Imported from SVN: r5820]]

automake versions didn't do this automatically)

[[Imported from SVN: r5819]]

[[Imported from SVN: r5818]]

[[Imported from SVN: r5815]]

 * Adapt superlu-dist.m4, parmetis.m4, hdf5.m4, dune/common/test/Makefile.am
   and duneproject to the MPI changes.

 * Add DUNE_CHECK_LIB_EXT, a wrapper around AC_CHECK_LIB which allows to set
   the library path.

[[Imported from SVN: r5814]]

support for out-of-source builds in Dune.

You call dunecontrol with a parameter --builddir=NAME
dunecontrol will create a subdirectory NAME inside each 
module and do an out-of-source build there.

Not necessarily all modules support out-of-source, but at 
least common/istl did work.

[[Imported from SVN: r5813]]

[[Imported from SVN: r5809]]

[[Imported from SVN: r5808]]

* Infrastructure to warn about the use of deprecated preprocessor make
  variables.
* Use that infrastructure to war about MPI_CPPFLAGS.

[[Imported from SVN: r5807]]

  - Introduce autoconf substitutions DUNEMPICPPFLAGS, DUNEMPILDFLAGS and
    DUNEMPILIBS.
  - Deprecate MPI_LDFLAGS and MPI_CPPFLAGS: the automake manual recommends
    against "_" in names of such variables, MPI_LDFLAGS actually contains
    mainly libraries and simply changing MPI_LDFLAGS to MPI_LIBS will probably
    break a lot of stuff.  By deprecating MPI_CPPFLAGS it is possible to make
    the preprocessor generate a deprecation warning with instructions to
    change both MPI_CPPFLAGS and MPI_LDFLAGS (though this has yet to be
    implemented).

[[Imported from SVN: r5806]]

[[Imported from SVN: r5804]]

Added test for version 4.0

[[Imported from SVN: r5786]]

[[Imported from SVN: r5782]]

use AC_PROG_LIBTOOL and AC_DISABLE_SHARED instead of
LT_INIT([disable-shared]).  LT_INIT may be the new way of doing this, but the
other are not yet deprecated and I could not get LT_INIT to work

tested with libtool 2.2.6 and 1.5.26

[[Imported from SVN: r5779]]

[[Imported from SVN: r5771]]

[[Imported from SVN: r5768]]

[[Imported from SVN: r5756]]

[[Imported from SVN: r5737]]

[[Imported from SVN: r5712]]