Fix various markup errors: use \longprogramopt{} more, and use it correctly.  (Closes SF #731689.)  Use \emph{} in a few places.
Fix various markup errors: use \longprogramopt{} more, and use it
correctly.  (Closes SF #731689.)  Use \emph{} in a few places.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator