Changes copied from the FrameMaker version.  Also documented some previously undocumented features.
Changes copied from the FrameMaker version.  Also documented some
previously undocumented features.

Packages and the import mechanism in general are still left
undocumented.

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