don't need to worry about them.

of suffix entry

Need to implement filter support (for entryDN and subschemaSubentry).
Fixed hasSubordinate assert() bug in entry filters

Misc Clean.

returned by the plugin, rather than that requested by backend_attribute(),
for ACL checking.

They should of course be the same but this is the "correct" approach from
both a security and readability perspective

This allows computed attribute plugins to also provide their attributes to
the ACL engine, for example

frontend stuff moved into a database structure, essentially to allow overlays to be processed before database selection; passes all tests (ITS#3080)

slightly rework user/operational attributes handling (including fixing a bug in the logic of the previous change to backend_operational()); cleanup; more improvements to slapo-rwm and back-relay