request #7301: Fix bug- Cardwalls don't take transition and dependencies into account on drag 'n' drop

- new expected behaviour: modal is shown with feedback errors if moving card from one column to another is not allowed or reaquires user input
Change-Id: Ia14e2252321691651129e0121e2e1f174f926c05
Merge commit 'refs/changes/41/2841/3' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #7301: Fix bug- Cardwalls don't take transition and dependencies into account on drag 'n' drop
This is Tuleap 7.3.99.38

Change-Id: Ib7348c37528f6db608268436e7fe6f617bf6f91b