[imp] [horde] large session entries in horde_sessionhandler

[liam hoekenga]

> Your issue may be related to the buggy clone()/Util::cloneObject()
> behavior that was fixed/worked around several weeks ago (this affects
> both PHP 4 and PHP 5).  You should search the dev@ and cvs@ lists for
> discussion on this issue.

I pushed the changes from CVS (FRAMEWORK_3) out, and it doesn't seem to have
helped the situation.

Liam