[schema,server] add a security debugging aid (closes #2920304)
- Add a DGB_SEC debugging flag (to be used with set_debug/debugged).
- Add a context manager (tunesecurity) to filter security assertions.
Note: this does not address all read-security mecanisms.
if 'same_as' in schema:
sync_schema_props_perms('same_as', syncperms=False)
sync_schema_props_perms('Bookmark', syncperms=False)