+ multi threaded main_loop.
  - use g_main, g_thread, g_io_add_watch.

+ search_db() should use GError error report frame work.

+ evalguard_cal(): Ditto.

+ IPv6 address capability.

+ generally improve the processing of smtpguard.conf
  - issue an error when an incorrect data type encountered
  - issue an error when an unexpected var is encountered 
  - etc...

+ when smtpguard-daemon is forced to reread smtpguard.conf
  with sig_hup and an error occurs, revert to the previous
  settings rather than exit

+ write man pages
