- Suppress raise of Undefined when the expression is an 'exists:'.

  - Stash referenced object, rather than bound method, as local value
    for iterator.

sorting a list of 30000 DateTimes is *eighteen times faster* when used
with Python 2.1 and 2.2.  (But this may actually just restore the former
performace of DateTime on Python 1.5.2.)  Also added tests.  This should
help ZCatalog.

Fixed worst of the problem by causing HTTPRequests to clear the lazy namespace at close time.

arguments for adding or changing a user.

This will make it easier for other user folder implementations to
interact with the standard user folder API.

Changed the session management icons. These new icons were made by Penny and Amos. They're not perfect, but they're better than what was there before.

replaced all calls with string methods

environment.  This guarantees that any subsequent recovery will be
very fast unless the database was not shut down gracefully.