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.

Right now, the manual just provides each of the plugins in a list where each plugin has one or more paragraphs, but these paragraphs are only marginally separated from each other visually. I would really like to emit this data as a latex environment, e.g., {itemize}. However, we also output this data into output/parameters.prm, so latex environments may be awkward because they're visually so distracting. (Again, however, we already do mark up many of the plugin descriptions with latex, e.g., in using complicated formulas.) Ideas?