apply the two caching patches proposed by Christoph Grüninger,
at least for me they worked flawless and showed some considerable configure speedup.

[[Imported from SVN: r6539]]

It has been deprecated at least since dune 2.0.

[[Imported from SVN: r6482]]

[[Imported from SVN: r6414]]

[[Imported from SVN: r6383]]

[[Imported from SVN: r6333]]

[[Imported from SVN: r6031]]

[[Imported from SVN: r5939]]

[[Imported from SVN: r5936]]

[[Imported from SVN: r5840]]

[[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]]

[[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: r5820]]

[[Imported from SVN: r5815]]

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: r5756]]

dune directory

[[Imported from SVN: r5694]]

[[Imported from SVN: r5646]]

[[Imported from SVN: r5637]]

@Christian: Could you please take a look at this?

[[Imported from SVN: r5602]]

[[Imported from SVN: r5583]]

* now libdunegrid is found
* delay LT_OUTPUT as long as possible

[[Imported from SVN: r5410]]

[[Imported from SVN: r5408]]

[[Imported from SVN: r5405]]

this should fix #466

[[Imported from SVN: r5379]]

[[Imported from SVN: r5361]]

  AC_REQUIRE([DUNE_SUB_VERSION_FUNCTION])
this is a relict and not needed anymore.

[[Imported from SVN: r5309]]

* use same code in dunemodules.inc and dune.m4

[[Imported from SVN: r5306]]

   see also http://www.opengroup.org/onlinepubs/009695399/utilities/awk.html
   
Credits go to Elias Pipping


[[Imported from SVN: r5296]]

[[Imported from SVN: r5281]]

[[Imported from SVN: r5280]]

[[Imported from SVN: r5225]]

[[Imported from SVN: r5213]]

[[Imported from SVN: r5176]]