fix ambiguous if/else statement
Fix the issue reported by Ian where an MPI implementation does not offer MPI_C_BOOL.
fix some TODOs
fix pressure normalization
add test
Merge pull request #105 from tjhei/fix_a_couple_of_todos

Fix a couple of TODOs
Merge pull request #107 from bangerth/fix-MPI_C_BOOL-issue

Fix the issue reported by Ian where an MPI implementation does not offer...
fix tests broken in 46893f6

It turns out that the change to log stuff into output/log.txt changed
the order of the header and the message of loading shared libs, which
broke 40 tests. This fix restores the original order and only prints the
header into the logfile as soon as that one is set up.
add benchmark files
update prm
add a notes.txt
add second variation for the a1 benchmark