Add test for finish_startendtag().

Style nits:

Add blank lines between class header and first method definition.

Move _parse_error() to earlier in the class.

as that of TALError.

Add finish_startendtag(), which works like finish_starttag() but is
called instead of that for tags of the form <foo.../>.  The default
implementation simply calls finish_starttag(), so the interface is
still compatible.

Changed comments indicating that finish_*tag() are Overridable
methods.

Got rid of the documented and implemented return value of
finish_starttag() -- it wasn't used.

2.2. Unfortunately, there are old products (Confera) that depend on
it. One brokenness is that this module depends on 'query' from
Lexicon that isn't there anymore.  Worse, the new 'query' in
UnTextIndex is not compatible. I've copied the old 'query' from an old
version of Lexicon here to try to make things better.

It should really be possible to pass in special word characters.

depends on a pre-catalog architecture and the post-catalog
architecture isn't fully cooked. To get positions, we need to either
store the positions during indexing, which is way too expensive, or we
need to be able to get to the original text when searching, which we
can't do.

For now we'll return something bogus, which will make 'near' searches
behave effectively as 'and' searches.

STX improvements to the DTML Reference. Also slightly improved the documentation of dtml-var entity syntax (again).

Simplify the path math used to make sure we can pick up unittest.

The module from Python was sgmllib, not nsgmllib.

(Should we still include the standard Zope license?)

are (still) not sequences.

Added standard main test functions and function-choosing script
handler.

Test for the HTMLTALParser code generator.

Add tests for some boundary conditions, including buffering artefacts.

._run_check():  Add support for passing the data in as a list of strings,
    to support simulating buffer boundaries.

Make the two headers in the summary (commented out) symmetric.

Re-wrote parsing of attributes to be more robust and detect
substantial errors more reliably.  (Now works even if "<" or ">"
occurs in an attribute value!)

Added documentation of the url attribute and how to use attributes with the entity syntax. Also clarified use of the fmt attribute.

finish_starttag():  Make sure we do not close too many levels; this was
    possible with some interactions between nested tables.

Merged in Jim's big fix from 2.3 branch dealing with returning the lexicon attributes of a Vocabulary object.

Test cases for TAL.HTMLParser module.

Add some helper functions for use in test cases.

Rename nsgmllib to HTMLParser; there really is not any SGML capability
beyond the HTML support at this point.  Rename all references.

New catalogs have 'lexicon' attributes that are lexicon names, but
old catalogs store their lexicons directly. This makes it hard
to manage text indexes correctly. Added some code to assure that
when a text index is added, we always pass the actual lexicon.

When converting BTrees, convert indexes in context. This is necessary
to help UnTextIndexes get their (previously) acquired lexicons.

UnTextIndexes now refer directly to their lexicons.

Added logic in conversion code to implement the rule above.

Took out some broken code to unscrew some hysterical breakage.