[425909] Add note about EEF and contributionIds to get proper Properties View title

Change-Id: I91ddd450a8459107092935d8ab85b3a0e1eddb40
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>
[423562] Use a local CheckStyle configuration

Use a local/relative reference for the CheckStyle configuration
definition instead of assuming every contributor will have correctly
imported our configuration in his workspace.

Change-Id: I100d0e48c9b3a3e6e7ce7d1b1966eb324cd791ba
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>