Added some new delta types discovered by Ronnie from ethereal"

Added some new delta types discovered by Ronnie from ethereal"

 - SAM_DELTA_RENAME{USER,GROUP,ALIAS}
 - SAM_DELTA_DELETE{USER,GROUP}

Renamed some of the unknown delta types and their unmarshalling functions:

 - SAM_DELTA_TRUST_DOMS
 - SAM_DELTA_SECRET_INFO
(This used to be commit 1f29276c2ff450c4ca3705c27fb0be71ddcda4ad)