This reverts commit 7b5181da.

fix index record detection

Deleting all indices should also reset default mask

Fix clashes with index records

Tweak config validity check

Allow configuring thresholds for specific attributes

Set error code on failure

Broken since original commit 113727ba

Make sure a->a_numvals matches id2v counts

Adds a regression test for 8663 that checks that it is possible to
modify all the cn=config related memberOf overlay settings.

Add a regression test for ITS#8616 that verifies the ability to change
the values for olcSpNoPresent and olcSpReloadHint

in idl_intersection. It may lose precision in a subsequent union.