Should not allow deletion of a tracker used in kanban

Part of story #7577 display a Kanban cardwall

Change-Id: I457669cc1dbfb2e6d93d5fbaecbf39ee9ef810b6
Remove hardcoded colors

Part of story #7577 display a Kanban cardwall

Change-Id: Ibbe4b24165a5b3c88dd74ccb80595c0ebe436002
Merge commit 'refs/changes/66/3366/2' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  Remove hardcoded colors
  Should not allow deletion of a tracker used in kanban
This is Tuleap 7.8.99.17

Change-Id: Iecbeb45b49e992410f156eeae726efe3a5920d69