[OPENENGSB-3602] Added new function toOpenEngSBModelValues to the OpenEngSBModel interface to get only the values of the model without the model tail
[OPENENGSB-3602] refactored the ManipulationUtils a little bit
Merge pull request #842 from Arcticwolf/OPENENGSB-3602

[OPENENGSB-3602] Add method to the model interface which returns the entries without the tail