Bug fix in DefaultModel.newVM|Node(int) that did not book the element.
Test some splitters
Fix VM/Node registering issue.
 Clarify apidoc due to Issue #21
Merge branch 'develop' into feature-staticPartitioning
Maintain the nodes and the VMs ids across partitions
- Test splitter for state-manager constraints
- API change: the splitter now know about the original instance, just in case
new tests for splitters
new splitters