running an individual module's uninstall action
* Add an DEINSTALL_TEMPLATE file that is pulled in by all wbm-* modules
that will run the module's uninstall action at DEINSTALL time.
* Fix the "time" module to ignore "sched_mode" -- verified by Jamie
Cameron on the Webmin mailing list as a bug.
* Fix the "postfix" module to remove its temp files at DEINSTALL time
so that we cleanly pkg_delete.
Bump the PKGREVISION of sysutils/webmin as well as all sysutils/wbm-*
packages that have uninstall.pl scripts.
