simplify doxygen input path
reduce warnings from thousands to hundreds as long as major code is undocumented
fix displayed include paths in doxygen output
fix some of the warnings
Patch by Alexander Grayver: Fix face interpolation between FE_Nedelec elements.

This patch fixes a bug in the FE_Nedelec::get_face_interpolation_matrix related to the wrong indexing of the DoFs located on element faces. This patch ensures that the code produces an interpolation matrix with full column rank meaning that all DoFs of the FE with lower order are constrained.
Merge pull request #53 from bangerth/fix-nedelec-interpolation-matrix

Patch by Alexander Grayver: Fix face interpolation between FE_Nedelec elements.

This patch fixes a bug in the FE_Nedelec::get_face_interpolation_matrix related to the wrong indexing of the DoFs located on element faces. This patch ensures that the code produces an interpolation matrix with full column rank meaning that all DoFs of the FE with lower order are constrained.
Merge pull request #45 from guidokanschat/doxygen_cleanup

Some cleanup of doxygen issues:
simplify doxygen input path
reduce warnings from thousands to hundreds as long as major code is undocumented
fix displayed include paths in doxygen output
fix some of the warnings
Merge branch 'master' of https://github.com/dealii/dealii
Correct return type of n_global_rows for 32 bit integers.