improved optimistic locking performance

improved optimistic locking performance

fixed websocket bug with safari under mac os

fixed text index creation

fixed cleanup

transaction implementation: implmented transaction handling of document deletions

transaction implementation: transaction is registered as owner of newly created documents

transaction implementation: several bugs fixed with events in UI

transaction implementation: several bugs fixed

transaction implementation: Transaction awarnes in Query Result Models and pagination optimization

transaction implementation: Shadow aware Query Result Cursor can handle newly created documents

transaction implementation: Shadow aware Query Result Cursor implemented

transaction implementation: shadow copies, simple isolation, rollbacks and commits implemented

fixed missing self reference after page resume

cache removal handle can now handle optimistic locks