r14634: Many bug fixes thanks to train rides and overnight stays in airports

r14634: Many bug fixes thanks to train rides and overnight stays in airports

* Finally fix parsing idmap uid/gid ranges not to break with spaces
  surrounding the '-'
* Allow local groups to renamed by adding info level 2 to
  _samr_set_aliasinfo()
* Fix parsing bug in _samr_del_dom_alias() reply
* Prevent root from being deleted via Samba
* Prevent builting groups from being renamed or deleted
* Fix bug in pdb_tdb that broke renaming user accounts
* Make sure winbindd is running when trying to create the Administrators
  and Users BUILTIN groups automatically from smbd (and not just check the
  winbind nexted groups parameter value).
* Have the top level rid allocator verify that the RID it is about to
  grant is not already assigned in our own SAM (retries up to 250 times).
  This fixes passdb with existing SIDs assigned to users from the RID algorithm
  but not monotonically allocating the RIDs from passdb.