Need to load storage drive via config - currently hardwired for 
x86_64 linux with hash driver.

Dspam Test case for classify=True

Test for large_scale set incorrectly (USER doesn't exist)

"Unchecked not spam" treats any new messages coming in since the
page was refreshed as unchecked.  If mbox has been updated since
refresh, refresh again and have user check new messages.  Or maybe
there is a way to detect new messages in the CGI.
