request #6444 - Agile dashboard performance with a lot of burndown

Change-Id: Icb9294c0209256825154e71047e114adcf501674
Merge commit 'refs/changes/00/2100/6' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #6444 - Agile dashboard performance with a lot of burndown

Conflicts:
	plugins/tracker/include/autoload.php

Change-Id: Ifcbb59a883f8f5a51ed7cf6cf57fa4090ae66b10
This is Tuleap 6.11.99.25

Change-Id: Ia979dfb7bef8397fc513d1bada360026f9ef16e3