maxlistusers property (managed from user folder properties tab) which
limits the number of roles that rolemanager's get_valid_users will return
before raising an OverflowError.  The DTML for listLocalRoles will insert a
text box for user id entry if OverflowError is raised.

discovered for a media client.  DTMLValidate is just validate with
different arguments -- this eliminates an argument remapping step.

_request(): Avoid recompiling the regular expression on every call.

output to (needed to catch output for
AccessControl/securitySuite/testSecurity.py).

-minor code cleanup

        Steve Alexander)

fixed typo

following whitespace ignored.

escaping logic.

DTML stuff is now roughly 8-10% faster.

makes Dreamweaver happier.

[Synchronizing the HTMLParser module with the Python standard library.]

Re-factor the HTMLParser class to use the new markupbase.ParserBase class.
Use a new internal method, error(), consistently to raise parse errors;
the new base class also uses this.

[Synchonizing the HTMLParser module with the Python standard library;
 the HTMLParser module is now dependent on this module.]

New base class for the SGMLParser and HTMLParser classes from the sgmllib
and HTMLParser modules (and indirectly for the htmllib.HTMLParser class).

This has all the support for scanning over DOCTYPE declarations; it warrants
having a base class since this is a fair amount of tedious code (since it's
fairly strict), and should be in a separate module to avoid compiling many
REs that are not used (which would happen if this were placed in either then
sgmllib or HTMLParser module).