Updates to various places of the documentation.
Adjust based on Guido's feedback.
Made MappingQ compatible with Manifold.
Merge pull request #164 from bangerth/doc-fixes-8

Updates to the documentation of the quadrature formulas.
Update documentation in a couple of places.
Remove uses of <tt>...</tt> in a number of places in favor of more
appropriate markups.
Reindent all short comments to standard length.
Merge pull request #154 from luca-heltai/mappingq_manifold

Made MappingQ aware of Manifold
Fix TrilinosWrappers::SparseMatrix::add(factor, other_matrix).
Convert two more places where we use <code>...</code>.
Merge pull request #168 from kronbichler/master

Fix TrilinosWrappers::SparseMatrix::add(factor, other_matrix).
Remove stray Id tag from svn from all headers
Merge pull request #169 from kronbichler/master

Remove stray Id tag from svn from all headers
Patch suggested by Xinzeng Feng <xf39@cornell.edu>: Fix a mistake in a code example.
Merge pull request #170 from bangerth/fix-formula

Patch suggested by Xinzeng Feng <xf39@cornell.edu>: Fix a mistake in a code example.
Merge pull request #160 from bangerth/doc-fixes-7

Update documentation in a couple of places.
Workaround for IBM compiler in data_out_base.cc

This is a workaround for the IBM XL compiler as suggested by Kevin
Drzycimski on the mailing list.
Merge pull request #171 from tamiko/workaround_for_ibm

Workaround for IBM compiler in data_out_base.cc
Augment documentation motivated by Martin's post on the mailing list.
Merge pull request #172 from bangerth/doc-fixes-9

Augment documentation motivated by Martin's post on the mailing list.