added the ability to start/stop the server from SWAT.

added the ability to start/stop the server from SWAT.

I needed to modify the way the pidfile is handled in nmbd and smbd to
do this. Jeremy, you may wish to look at what I've done as it probably
breaks the Whistle use of pidfiles. In particular I've removed the -f
option and instead smbd and nmbd always create a pidfile in the lock
directory.
(This used to be commit 20bb22d61b986d2036c681fc33db60f2b2b3c1c7)