checkin of myformat.sty.

Change "\renewcommand{\indexsubitem}{(...)}" to "\setindexsubitem{(...)}"
everywhere.

Some other minor nits that I happened to come across.

Remove references to regsub, which is obsolescent.

Changed references to regex/regsub modules to point to re.

to use the same, better words to explain start/end.

	* \bcode, \ecode added everywhere
	* \label{module-foo} added everywhere
	* A few \seealso sections added.
	* Indentation fixed inside verbatim in lib*tex files

Change replace() arguments; remove replace1().

to split.  Document new conventions for split(fields) and
join(fields), where the *fields variant is identical to the other.

 unified style; etc.

	removed references to {ato{f,i,l},index}_error

libstring.tex: added count().
ref2.tex: new keywords; moved keyword printing program to keywords.py.