Augment the documentation.
Merge pull request #8 from bangerth/master

Augment the documentation.
add another main goal in the documentation
Merge pull request #9 from tjhei/editmanual

add another main goal in the documentation
Fix forgotten resizing of depth average files. Add an assertion.
Merge pull request #10 from bangerth/fixes

Fix forgotten resizing of depth average files. Add an assertion.
Style fixes.
More style fixes.
Simplify some code. More style fixes.
Style fixes.
More style and documentation fixes.
Merge pull request #11 from bangerth/fixes

Style and documentation fixes