Huge number of docstring changes, typo fixes, rewordings, GNU standard

conformations, etc., etc. inspired and given by Michael Ernst.  These
include error string fixes, moving of comments to docstrings, some
other non-related typos, terminology standardizing (b/w TP and myself,
and b/w myself and myself :-) although more can still be done.
E.g. "outdenting" => "dedenting".