Code for tracing from papyrus SysML to Pror by:
* creating a Package ProxyRequirement if needed, then inside 
* adding a SysML Requirement (Id & text based on the ProR requirement) 
* adding Satisfy relation between the selected SysML element and the
created SysML Requirement (Id based on teh ProR trace element).

Authors: Matthieu Perin & Patrick Tessier @ CEA list
Multiple correction made on several plugin of teh toolcahin to be more
compatible to a standard Eclipse Kepler Papyrus.

Not mandatory.
Merge of local branch for plugin org.openetcs.pror.tracing.sysml, closing issue #349 and partially #380
Merge branch 'master' of github.com:openETCS/toolchain