Sort the names of plugins in the documentation. Upon visual inspection, also fix a number of formulas and text issues found in the manual's description of the various plugins.
Update, using the latest deal.II version.
Merge branch 'sort-model-names' of https://github.com/bangerth/Aspect
Merge branch 'master' of https://github.com/geodynamics/aspect
Sort the names of plugins.

Sort the names of plugins in the documentation. Upon visual inspection, also fix a number of formulas and text issues found in the manual's description of the various plugins.
Merge pull request #84 from bangerth/sort-model-names-try-2

Sort the names of plugins.
Merge from upstream.