Convert to re module; remove all references to regexp and regsub

Added support for the new texinfo @url{} and @email{} commands

	navigation links for HTML 3 version.

	Forced a blank line above the footnotes separator for HTML 2; at
	least one page did not get this spaced correctly.

	print section titles even when the debugging output is not enabled.
	Added -3 option to generate HTML 3.0 constructs where meaningful.

	Removed repititive garbage generation:  the old version added simple
	descriptive comments after every datadesc/funcdesc/*desc entry:

	function(args) -- function of module xxxx
	    Description....

	These comments are no longer generated:

	function(args)
	    Description....

	to 4 spaces per level (no longer 8).

(Makefile):  Use .pyc versions of partparse.py and texi2html.py to generate
	converted documentation formats.  This reduces the startup costs;
	probably doesn't affect anyone but me in reality, but helps when
	working on the docs.