genrand.c: Improved generation of random values, more secure.

genrand.c: Improved generation of random values, more secure.
loadparm.c: Started add of 'security=domain' code.
password.c: Fix for security=server NT bugs.
reply.c: Started add of 'security=domain' code.
server.c: Started add of 'security=domain' code.
smb.h: Started add of 'security=domain' code.
Jeremy.
(This used to be commit e6bda112ebe0d41f54c4249b5c2e1f24011347e1)