isinstance will raise an Exception first. I now catch this exception.

Shanes traceback patches provide a much better functionality.

        (see doc/ENVIRONMENT.txt)

      - Propertysheets: Ids like 'values','keys' and 'values' are
        now forbidden as they break WebDAV functionality. Existing
        Propertysheets are not affected

give them extended log format like HTTPServer

Upload buttons on DTML, Py Scripts, Files, Images and PTs raise an error
if the file is not specified instead of clearing the source (Bug #144)

the object pointers aren't initialized (because the constructor was called
with an invalid number of arguments)  This just amounts to using the XDECREF
macro rather than DECREF.

        avoid breaking some FTP clients and the output format
        with overlong usernames.

        wrong number of indexed objects for FieldIndexes.

whrandom triggers a DeprecationWarning when using CVS Python.

        are no longer deletable to prevent malfunction.

support for exceptions who raise an exception in str(). They get represented as <unprintable X object>

Decide whether a body is html by looking at the body we are actually going to use, rather than the body we were originally given. We may have given it an html wrapper a few lines earlier.

No need to use a full sweep now. the incremental collector is sufficiently effective at keeping memory usage in check, and does not have the severe performance implications

del transientobject['key']

Would fail with a slice error (due to the security machinery).

Assigning __garded_delitem__ to __delitem__ solves this problem.

Merged shane-better-tracebacks-branch.  The changes are explained in http://dev.zope.org/Wikis/DevSite/Proposals/BetterTracebacks