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HTML examples seen in the wild that cause parse errors
in HTMLParser include:
<a width="100%"cellspacing=0>
 -- note lack of space between val and next attr name
<a foo=>
 -- trailing attribute has no value after =
<a href=javascript:popup('/popup/html.html')>
 -- javascript fragment with embedded quotes
My patch contains improvements to the 'attrfind' and
'locatestarttagend' regexps that allow these examples
to parse.
The existing test_htmlparser.py unit test continues to
pass, except for the one test case where it considers
<a foo=> to be an error.
I commented out that case and added new test cases to
cover the examples above.