cannot log in the popper daemon, let the users decide for either
a default file (use a copy of the system's /etc/ftpusers file)
or an empty file
2) also, make the installation of this file prefix safe and name
it popusers (PREFIX/etc/qpopper/popusers). This changes expected
behavior of the port
3) add a PKGINSTALL script to handle this file install/deinstall
4) style changes: use variables to make the port easier to maintain
Prompted by: Dan Langille <dan@langille.org>
Reviewed by: freebsd-ports (silence), kris, sobomax
d494132719