Changes

[205] Correctly clean clipboard from SetStyleToWorkspaceImageTests

Some tests from
org.eclipse.sirius.tests.swtbot.SetStyleToWorkspaceImageTests copy an
image to the clipboard but do not clean it after the test. This could
have side effects on the following tests.

This was the case in some tests of TabBarTest that failed in the suite
org.eclipse.sirius.tests.swtbot.suite.AllUnreliableTestSuite because
SetStyleToWorkspaceImageTests is executed before TabBarTest.

Bug: https://github.com/eclipse-sirius/sirius-desktop/issues/205

[test] Remove tests from TabBarTest as unreliable

The tests from TabBarTest are no longer unreliable.

[362] Fix the bug in the refresh of the layer tooltip

When the VSM is changed, the tooltip of all layers is updated. But the
tooltip list was never cleared between two menuShow. So the first N
tooltip text (with N, the number of layers) were always the same and the
updated tooltip were in an unreachable position (at the end) in the
list.

Bug: https://github.com/eclipse-sirius/sirius-desktop/issues/362
Signed-off-by: Séraphin Costa <seraphin.costa@obeosoft.com>

[doc] Fix broken anchor link in Sirius Specifier Manual

Signed-off-by: Séraphin Costa <seraphin.costa@obeosoft.com>