dosutils: add Novell-style REVOKE and REMOVE trustee tools

Implement REVOKE and REMOVE for the Client32 DOS utilities.

REVOKE now supports Novell-style syntax:

  REVOKE rightslist* [FOR path] FROM [USER|GROUP] name [options]

and removes rights from explicit trustee assignments.  It scans the
trustee list first, updates the trustee rights mask, and deletes the
trustee entry when no rights remain.

REMOVE now supports Novell-style syntax:

  REMOVE [USER | GROUP] name [FROM path] [option]

and deletes explicit trustee assignments for users or groups.

Both tools support USER/GROUP lookup, /FILES, /SUBDIRS,
/SUBDIRECTORIES, wildcard file targets, recursive directory handling,
Novell-style help text and summary output.  Missing trustee entries are
reported with Novell-style "No trustee for the specified ..." messages.

Add shared trustee helpers and Client32 NCP87 trustee scan/delete
support.  Also adjust GRANT ALL so it matches Novell behavior by not
granting Supervisor implicitly; Supervisor must be granted explicitly.

net.c

@@ -37,6 +37,8 @@ static struct s_net_functions {
 {"FLAG",   "display or modify file attributes",     func_flag   , 0},
 {"FLAGDIR","display or modify directory attributes",func_flagdir, 0},
 {"GRANT",  "grant trustee rights",                  func_grant  , 0},
+{"REVOKE", "revoke trustee rights",                 func_revoke , 0},
+{"REMOVE", "remove trustee",                        func_remove , 0},
 {"RIGHTS", "display effective file/directory rights",func_rights, 0},
 {"SLIST",  "list servers",          		    func_slist  , 0},
 {"PASSWD", "change password",          		    func_passwd , 0},