[LOG] edit the change log for cosmetic branch, error management and vmp coupling

CHANGELOG.md

 ## Changes for next release
- * ... to be completed
+ * [New] error management in mbs load, part and dirdyn (not yet in Real Time, equil and modal)
+   See the wiki in gitlab for the corresponding pptx
+ * [New] CI automatic tests added for equil module + file tree of example project remodeled.
+ * ? Coupling VPM branch merge : Filtering is active if the flag dirdyn->filt=1. Otherwise, we do as usual.
 
 
 ## Robotran v1.11.0