D-Net

Re-introduce some properties of the JobNode that I had wrongly removed in the previous commit.

cleaning parameter passing in the workflow and using the datasource original id instead of the repository id as param of the validation BB message

removed useless MergeEPR Job Node

camel case param name

#1448#note-11: blacklistGuidelines is another param.

#1448 updated BB parameters for validation

onDone not needed. onOnGoing must do its job only once

cheat on the blackboard: pretend the validator has finished when it sets its status to ongoing, so we can give the push RS to the next node straight away