[hashcash] hashcash-sendmail daemonizes better.

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About a month ago, the environment around my hashcash-sendmail changed, and
it started getting SIGHUP from an external source.  It took me a while to
even notice it, but it's lead me to two changes:

1. I now use SIGUSR1 to notify myself of new queue items instead of SIGHUP.

2. I call setpgrp() and setsid() to really get the parent process off my
back after forking.  If that doesn't work, it whines in the log.

I encourage current users to upgrade, but if you're not having a problem,
don't worry about it.
- -- 
Kyle Hasselbacher | Ships are safe in harbor,
kyle@xxxxxxxxxxx  | but they were never meant to stay there.
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