Server via the new 'V' command from the Reading Mail prompt allows you to
toggle between all mail (including SPAM, the default), SPAM only, or HAM only.
Also added a new '/' (search text) command from the reading mail prompts.
Mail imported before the mailsrvr added support (recently) for the MSG_SPAM
attribute flag will not be counted/filtered as SPAM.
SBBSecho will have a commit (next) to support the new loadmail() usage, it
will not compile until then.