request #6216 : datepicker is reusable in tracker report

Change-Id: Ie6b3a93a318d288c372f7515510ed856b63485dc
Merge commit 'refs/changes/89/1989/1' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #6216 : datepicker is reusable in tracker report

Change-Id: I806c99037593aabee632662b23e1b12d4bb94a82
This is Tuleap 6.10.99.44

Change-Id: I691d015dccc3620b0448f2caa6153c13c7239eac