beforesave and aftersave hooks for calendar rooms have been

beforesave and aftersave hooks for calendar rooms have been
updated to handle text/calendar items that may be buried inside
a multipart message.  It still handles this data if it appears at the
top level too, of course.   And the new algorithm is both cleaner and
more efficient because it just calls the mime parser instead of doing
all sorts of weird string scanning.  Isn't progress wonderful?