- allows dumping of the process env
- csv output of memory usage stats
- exception handlers

We actually need a mix of cmake magic and config.h to work
* if alberta is not used (then the config.h define is taken)
* alberta is actually used (then the dimension has to be specified for the
  target at hand with add_dune_alberta_flags(GRIDDIM $dim $target))

This reverts commit 35aa624d.

This reverts commit db210150.

refactor la backends discovery/usage

Since we are pulling dune-fem, and thus dune-grid and dune-alugrid in turn,
the unspecialized DGF parser is pulled, which does not compile with
dune-alugrid.

Unfortunately, alberta headers globally defines TEST, which leads to tons
of compiler warnings. Te clean solution is to not let gtest define TEST.
This unfortunately requires us to write GTEST_TEST instead of TEST.

# Conflicts:
#	.gitignore
#	.travis.yml
#	dune.module

This did not compile for me with clang 3.8.1-12~bpo8+1 using gcc
4.9.2-10 stdlib. Any objections against this change, @dune-xt-common-devs?
Was there any reason to use int instead of double in the first place?