[issue2830] Copy cgi.escape() to html

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Looks good already.  Two points:

* if we do the move, we should finally make sure all problematic characters are escaped.  For now, I think the single quote is the most important one in attribute mode.

* the new docs for cgi.escape() are missing a newline between signature and body.

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<http://bugs.python.org/issue2830>
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