tasks #6684: max width for artifact view (960px)

Change-Id: I7f0bbeeb3d2b532cfea127388c0fb26e19535a89
Merge commit 'refs/changes/87/2287/7' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  tasks #6684: max width for artifact view (960px)

Change-Id: I2877570915ddb0558c1bcc0bc7ce67d7a3fa8539
This is Tuleap 6.12.99.58

Change-Id: Iafb5cbcae737f9a0007ee97e98a832f882bd86a7