Unified batch friendly window pool factory

and some minor improvements to stats and toString() on InputEntities. Also
abstracted available memory calculations into its own class and has
LongArrayFactory.AUTO use that. So there are now mock tests around that
calculation and LongArray allocation.
Tagging for version 2.1.0-RC1
Back to development version.
Merge pull request #2426 from tinwelint/2.1-unified-batch-wpf

Unified batch friendly window pool factory
Fixes compilation error
Workaround since IntelliJ is being difficult
Cleanup of QueryProjection in SimplePlannerQueryBuilder
Make PathValueBuilder null aware
Turn off projection of pattern expressions in Ronja

Changed most ReturnAcceptanceTests to use queries without START so they go through Ronja