[build] Re-sync sirius_helios.targetplatform with the others.

Change-Id: I67de679c373e9c550b2f2fd3664d91822e1f8cc7
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>
[build] Add PaperClips directly into the Sirius update site.

This should allow people to install Sirius by referencing only our
update-site (in addition to what it configured by default in a
standard Eclipse package).

Change-Id: I797a0d8e11099a82316ae00cc9f94e2abc21df4f
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>
Fix warnings in viewpoint.ecore.

It looks like EMF 2.9 introduces stricter validation rules for Ecore
models, which procude a few warnings in viewpoint.ecore about invalid
default value literals for some of our EENum-types attributes. Fix
this by setting proper defaults and re-generating.

All our Ecore models now validate fully with EMF 2.9.

Change-Id: I64e98bd729dd2b0a59d1b8ddde8d6e7dafa23136
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>
Remove useless copyright fields in generated code.

Change-Id: I56ff4564cdd948021c4d61cf6a419bdde5befb1a
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>