group database API

[Luke Kenneth Casson Leighton]

ok, it's almost ready, first pass, and it's even documented in smb.conf.yo
(hurrah)

create: /usr/local/samba/lib/local.map
and put "local group map = above file name".

create: /usr/local/samba/lib/.map
and put "domain group map = above file name".

create: /usr/local/samba/lib/domainuser.map
and put "domain user map = above file name".


in local.map, put entries like:
wheel=BUILTIN\Administrators
sys=BUILTIN\"System Operators"
some_local_unixgroup=some_NT_local_group

in domain.map, put entries like:
users="Domain Users"

to get them to be distinguished from the _local_ BUILTIN group named
"Users".


hm.  domainuser map doesn't work right now, i'll fix that.