Dynamically load milestones of a planning

When a project has many teams, the default number (5) of displayed
sprints is not sufficient. Let the user click on [more] link in order to
display additional milestones.

This fix request #1919

Change-Id: I2a0437ce0226a7c4eb907068b41760b5f7c84952
Fix sla #4006: fix autodection of redhat/centos version

Change-Id: Ia181c927e49a2746e42156657a2a674935a6548e
Merge commit 'refs/changes/61/561/1' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix sla #4006: fix autodection of redhat/centos version

Change-Id: Ic1e58bd3ba8a0ac6cba838a5317975678efc8d12
Tuleap 6.1.99.27

Change-Id: I290a6b51ac6dd65a0c92338a141a29bc212caeae
Merge commit 'refs/changes/48/548/4' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Dynamically load milestones of a planning

Change-Id: I84db499187af62e7d1f6cb8d201861e5a75405c4
Tuleap 6.1.99.28

Change-Id: I97dfc4fee296b03d549de0a1074489485ddca0a7