* fixed bug in BPMNData correlation handling:
 = allow correlation to an execution where no correlation property is set yet
* extended default Camunda correlation handler:
 = allow correlation to execution and to process definition (for correlation upon instantiation)
 = allow partial correlation based on uninitialized correlation keys
+ pattern 6: on-from-many-receive in 2 implementations (receiving instance created by first message, receiving instance already running)