Fix the long standing bug which caused newly installed GConf
applications to not pick up their default configuration values unless
gconfd-2 was manually restarted. Now:
- gconftool-2 --makefile-{install|uninstall}-rule will send a SIGHUP
to all the gconfd-2 processes.
- upon receipt of that SIGHUP, gconfd-2 will reload the database and
therefore pick up the added/removed schemas (note that the stock
gconfd-2 already reloaded the database when receiving a SIGHUP, but
only in the periodic cleanup which ran every 30 seconds; I've
modified it to reload the database immediately so that applications
can be started right after they have been installed).