to fix broken "make doc" and "make headercheck".

[[Imported from SVN: r1917]]

The latter is the location of the package configuration files.

[[Imported from SVN: r1899]]

[[Imported from SVN: r1790]]

[[Imported from SVN: r1787]]

[[Imported from SVN: r1786]]

Update test to conform common style.
Changed user variable SUPERLU_DIR to SUPERLU_PREFIX.

[[Imported from SVN: r1731]]

This was due to the fact that find_<lib|file>(varname ...) sets
${varname} to varname-NOTFOUND if nothing is found.
Therefore using the variable varname in
CMAKE_REQUIRED_<LIBRARIES|INCLUDES> is a really bad idea.

We are preventing this now by checking the variables first.

[[Imported from SVN: r1722]]

[[Imported from SVN: r1721]]

[[Imported from SVN: r1720]]

  after configure)
- Make CMake module installation path configurable
- Detect CMAKE_MODULE_PATH automatically
  + First call find_package(dune-common) to query its CMAKE_MODULE_PATH
  + Then setup the module path
  + After each find_package of dune module update the CMAK_MODULE_PATH
  + each module exports ist own <package-name>_MODULE_PATH in the
  + package configuration files

[[Imported from SVN: r1714]]

[[Imported from SVN: r1708]]

- Removed dependency on cmake version 2.8.9

[[Imported from SVN: r1707]]

[[Imported from SVN: r1706]]

Make sure the function add_dune_superlu_flags is always defined.

[[Imported from SVN: r1703]]

[[Imported from SVN: r1698]]

Add missing include.
Improve library search.

[[Imported from SVN: r1696]]

Rework SuperLU check; it conforms to the way CMake wants checks. Thanks to Markus Blatt for the hints.

[[Imported from SVN: r1695]]

[[Imported from SVN: r1678]]

Add test for HAVE_MEM_USAGE_T_EXPANSIONS needed for SuperLU 3.0.
This fixes CMake Bug #133.

[[Imported from SVN: r1655]]

Add HAVE_SUPERLU et al. to config.h.
Update test set up to handle SuperLU tests correctly.

[[Imported from SVN: r1615]]

Some variable from FindSuperLU.cmake are now cached.
Added function add_dune_superlu_flags.

[[Imported from SVN: r1613]]

[[Imported from SVN: r1606]]

it is not found there, it silencely fails and searchs the default installtion
locations.

[[Imported from SVN: r1605]]

[[Imported from SVN: r1604]]

[[Imported from SVN: r1602]]

[[Imported from SVN: r1586]]

modul name (lower case with dashes).

These leads to kind of weired variabable names (dune-common_DIR,
dune-common_LIBRARIES, etc.) but finds non-installes modules
easier. You just sets CMAKE_PREFIX_PATH to the directory containing
the modules.

[[Imported from SVN: r1584]]

to install modules anymore.

[[Imported from SVN: r1578]]

example compiles with fusion.

[[Imported from SVN: r1576]]

[[Imported from SVN: r1556]]