[437097] Test to check edge stability after a drag'n'drop

Replace checking bendpoints final positions with expected values by
checking the behavior of an edge movement.
One edge can be moved from one side or can be shifted by a constant
vector.

Bug: 437097
Change-Id: I12736550f7ed777e9198f668edf5f42e8582bf9a
Signed-off-by: Laurent Redor <laurent.redor@obeo.fr>
[cleanup] Adapt .gitignore to the new name of the JUnit tests plug-in

Change-Id: I7e261a923d8a18d6a289eb617f572a68c444f1ec
[446017] Open all external links in a new tab

Bug: 446017
Change-Id: I195d40dcbefbbb5278fae3f20747d5c7e39d7630
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>