Make child process pretty name optional for qpsmtpd-prefork.
Ignore rather than crash for uninstalled plugins.
git-svn-id: https://svn.perl.org/qpsmtpd/branches/0.3x@675 958fd67b-6ff1-0310-b445-bb7760255be9
Patch against current svn which removes references to highperf, and
various other cleanups in the code.
git-svn-id: https://svn.perl.org/qpsmtpd/branches/0.3x@641 958fd67b-6ff1-0310-b445-bb7760255be9