* usergoto() can now be supplied a NULL room name to signify that the caller
has already copied the quickroom record into CC->quickroom. Eliminates
an extra database fetch.
* NewMailCount() now uses a per-session counter, which is incremented
by CtdlSubmitMsg() when the user receiving a message is logged in at the
time the message is saved. This eliminates the need to load and scan the
user's mailbox every time a <G>oto operation is performed.
* The old NewMailCount() function is now InitialMailCheck() and is used at
session startup time.