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
Only use admin status not leader status
Clarify admin01 variable name
Merge pull request #1563 from bpindelski/rebased/develop/11274-oj-refactor

Clean up OmeroJava (see #11274) (rebased onto develop)
Add SimpleBackOff to avoid LockTimeout-s.
remove svn revision notes
add guest user to Roles object
add convenience predicates for boolean role properties
fix #11465: add further admin action validation

Conflicts:
	components/server/src/ome/logic/AdminImpl.java
minor code cleanup to reduce compiler warnings

Conflicts:
	components/server/src/ome/logic/AdminImpl.java
add Javadoc documenting #11465 changes
reword admin user text
do not allow users to be removed from all groups
remove unused import