r12005: added a SDDL (Security Descriptor Description Language) parser. Not

r12005: added a SDDL (Security Descriptor Description Language) parser. Not
all flags are covered yet, and object aces aren't done yet.

This is needed for ACL support in ldb, as the default security
descriptor for each object class is given by the
defaultSecurityDescriptor attribute in the schema, which is stored in
SDDL format
(This used to be commit dbdeecea01a8b362a9a525a3689cb03662a86776)