Fix numerous doxygen markup problems.

Doxygen got bent all out of shape in various places because formulas were opened
but not closed, and a number of other markup problems as well.
Merge pull request #40 from bangerth/doc-fixes

Fix numerous doxygen markup problems.

Doxygen got bent all out of shape in various places because formulas were opened
but not closed, and a number of other markup problems as well.
CMake: Fix various bugs in check_01_cxx_features

This commit fixes a typo of the "-std=c++0x" fallback found by Chad Balen
(mailing list).

Furthermore, the fallback logic was also broken (as reported by Wolfgang).
Merge pull request #42 from tamiko/fix_cxx11_setup

CMake: Fix various bugs in check_01_cxx_features
Fixing problems with MGConstrainedDoFs
implement deprecated get_refinement_edge_boundary_indices()
use new logic in multigrid assemblers and switch step 16 to MeshWorker
Merge branch 'mg2' into new_multigrid_tests
Merge branch 'guido-new_mg' into parmg
use new logic in multigrid assemblers and switch step 16 to MeshWorker
all existing multigrid tests verified with fixed MGConstrainedDoFs
new test for Neumann data
Correct a minor violation of coding standards.
Fix a typo...
Merge pull request #44 from oneliefleft/master

Correct a minor violation of coding standards in Petsc wrappers
Update documentation of step 16
Fix minor issues in multigrid tests
Merge pull request #43 from guidokanschat/new_multigrid_tests

Fix logical problems in MGConstrainedDoFs and rewrite step 16
Add empty virtual destructors for TimeStepping and RungeKutta.
Merge pull request #46 from Rombur/time_step_petsc

Add empty virtual destructors for TimeStepping and RungeKutta.
Testsuite: Move forgotten file to correct location

All testsuite stuff is now under ./tests. Consequently,
macro_pickup_tests.cmake should also be moved.