Update PATCH /backlog_items/{id}/children to manage move

Change-Id: I49dba26bb02d73de330b65722db520ad64c5f652
Update PATCH /milestones/{id}/content to manage move

Change-Id: Ifceee665b8c4f07798610c2b50a80bc94a8b4db0
Update PATCH /milestones/{id}/backlog to manage move

Change-Id: I9f180c8699858d31d956bbf91a67f75a61658fb3
Update PATCH /projects/:id/backlog to allow removal from milestone contents

Change-Id: I238776eb0adb8dcbdd685764e285d077a7d191df
Fix notice in resource patcher

Change-Id: Ib65b2749dac1d4515ce1c0e47c3f80507ce03580
Merge commit 'refs/changes/53/3353/4' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix notice in resource patcher
  Update PATCH /projects/:id/backlog to allow removal from milestone contents
  Update PATCH /milestones/{id}/backlog to manage move
  Update PATCH /milestones/{id}/content to manage move
  Update PATCH /backlog_items/{id}/children to manage move

Change-Id: I40882ac7bea414a32637996977821369678b2381
This is Tuleap 7.7.99.78

Change-Id: If704a2c6c9aa17184db0ab72363352e3458d762a