[ui] Add the commands for toggling breakpoints.

These commands are still commented (even they are deprecated) since
there is no clear replacement of the corresponding old actions by
handlers.

see #136

Signed-off-by: Stéphane Galland <galland@arakhne.org>
[lang] Add operation extensions for Maps.

see #250

Signed-off-by: Stéphane Galland <galland@arakhne.org>
[eclipse] Display an error message when the Xtext output configuration is not matching the Java source folders.

Signed-off-by: Stéphane Galland <galland@arakhne.org>
[tests] Add unit tests for SARLMapExtensions.

see #250.

Signed-off-by: Stéphane Galland <galland@arakhne.org>