Define stuff to allow simple HTML-only selection using TeX's \if<foo>...\fi

stuff.  \ifhtml ...\fi for HTML only.

Doc/texinputs/python.sty

@@ -646,6 +646,11 @@
 % I'd really like to get rid of this!
 \newif\iftexi\texifalse
 
+% This is used to get l2h to put the copyright and abstract on
+% a separate HTML page.
+\newif\ifhtml\htmlfalse
+
+
 % These should be used for all references to identifiers which are
 % used to refer to instances of specific language constructs.  See the
 % names for specific semantic assignments.