Bug 575438 - [SysML] add element group display in the model explorer
 + in addition fix some reference to plugin.properties in some plugin
 + add a missing about.html

Signed-off-by: Patrick <Patrick.Tessier@cea.fr>
Signed-off-by: Vincent Lorenzo <vincent.lorenzo@cea.fr>
Change-Id: I3fb0dcbd45ad5404d39f846ccb9f5a7b430309ae
67 files changed