Fixes:
- mysql_adaptor: re-speedup queries that came to ran without an index
- mbop: make the "clear-profile" operation do clear g-web settings again
- zcore: workaround potential hang during shutdown
Enhancements:
- emsmdb, zcore: allow "Empty Folder" operations in public stores
- exmdb: increased verbosity during shutdown phase so it does not appear like a hang