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]]