Merge changes from topic "exceptions"
* changes:
Submit: Do not request fields from index when computing topic size
OnlineReindexer: Catch all RuntimeExceptions at top level
ChangeData: Remove remaining throws clauses
Throw StorageException instead of IOException from Indexers
Throw StorageException instead of IOException from Index
Remove StorageException catch clauses from httpd
Remove StorageException catch clauses from gpg
Remove StorageException catch clauses from elasticsearch
Remove StorageException catch clauses from Prolog predicates
Remove StorageException from throws clauses
Make StorageException a RuntimeException
Rename OrmException to StorageException and move to exceptions package
Rename common.errors package to exceptions
