Fix long-missing DELETE EventLogs

This check has been wrong throughout the 4.4 series.
If this is the last element, then EventLogs should be
raised for every OriginalFile deleted. This has not
been happening. (Very sadly)

This should be rebased onto dev_4_4
Support hierarchy in views.py list_scripts() json
scripts menu supports multi-levels on click
Syling improvements to scripts menu
Close scripts menu when script is launched
Remove menulist transitions from Chrome/Safari
Add base filters to cover meta classes.
Clear context in SessionCache
Fix misc. failing session test
Removing JDK7-comma from object.vm
Make enable/disable of filters multi-filter safe

With the addition of multiple filters, disabling by name was
throwing a concurrency exception in the while-loop. This now
makes use of an internal map which can be modified in place.
Remove old, incomplete comment
Add parens around the clauses
Clean transform tag method.
Fix refresh issue of tagged loaded datasets.
Allow to reset datasets.
Remove System.err.println
Fix refresh of tagged objects.
Fix indent and change date in header
Update date in header.