adding clearsessions to let admins clean out expired sessions
adding link to Django documentation
Remove unused import
Remove size limit for preview.
Limit preview to non big images.
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
Remove import
Fix tooltip. Arbitrary Limit was still displayed.
Review loading sequence

When selecting image in sequence, the flag "isLargeImage" was
returning the value associated to the previous image selected
This led to big image being displayed in preview.
Sequence has been modified to avoid such situation.
OMERO5.1DEV__6: create link insert triggers
5.1DEV__6 upgrade scripts
Add 'DROP TRIGGER' statements to insert-triggers.sql
fixing issues with cleaning sessions, close #12435

This commit add customized filesessionstore.py to replace
django.contrib.sessions.backend.file.py,
see https://code.djangoproject.com/ticket/22938
Once this is fixed filesesionstore.py should be removed in favor of the new
Django version
adjusting formatting
making session cookie parameters configurable

SESSION_EXPIRE_AT_BROWSER_CLOSE and SESSION_COOKIE_AGE
Also delete DBInsertTriggerCheck config
Bump dbpatch in OMERO5.0__0.sql
Fix 'name = ()' syntax error
Use Ice.Default.Host if available (Fix #12424)