add parallel direct solver test
Merge pull request #78 from tjhei/direct_solver_test

add parallel direct solver test
add PETSc configuration and test support

This is a combination of 9 commits:
be silent about finding tests
add configuration parameter to find PETSc
We need to check if deal.II has PETSc support and add the compile flag
if we want PETSc.
write into detailed.log if we have PETSc
include PETSc string in build info on tester
add support for PETSc tests
rename USE_PETSC to ASPECT_USE_PETSC
update changelog.h
Merge pull request #77 from tjhei/petsc_configure

add PETSc configuration and test support
manual updates: extract all .prms

We now auto-generate the annotated .prm.out files from the .prm files when you
make manual.pdf. All prm snippets in the manual now live in external
files. This patch also contains updates to the benchmark section explaining
how to compile the shared libs for the benchmarks.

This is a combination of 9 commits:
extract more prms from manual
manual: add section explaining benchmark compilation
add missing .prm
change to more safe escaping in .prm for manual
final batch of prms extracted from the manual
rename sol_cx.prm and improve manual
rename sol_kz prm
remove all .out and generate them on demand instead
update .gitignore
Merge pull request #75 from tjhei/manual_updates

Manual updates