DB: Annotation link insert triggers for search

REINDEX event logs were only being created for annotation
and annotationlink UPDATE and DELETE actions meaning that
on new tag creation created, re-indexing of the annotated
object was not happening.

This commit adds DBInsertTriggerCheck which adds triggers
once on startup. If this fails (due to permissions, etc.)
only ERRORs will be printed to the log. An admin can then
try executing the included insert-triggers.sql file again
Move scripts in prep for regeneration
OMERO5.1DEV__6: create link insert triggers
5.1DEV__6 upgrade scripts
Add 'DROP TRIGGER' statements to insert-triggers.sql
Also delete DBInsertTriggerCheck config
Bump dbpatch in OMERO5.0__0.sql
Fix 'name = ()' syntax error
Merge pull request #2729 from joshmoore/rebased/develop/insert-reindex-triggers

DB: Annotation link insert triggers for search (rebased onto develop)