story #7437: rename priority field into rank and warn admin that this field will evolve

Change-Id: I798dde47f5e5eb7f32c2f4d7c38d1c8086956f99
story #7437: replace global rank by N/A

Change-Id: Ie76bbd31768d0b3249ae825c7fdee7068404c1d2
Merge commit 'refs/changes/18/3118/3' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #7437: rename priority field into rank and warn admin that this field will evolve

Change-Id: Ibb1eba857f3bdc29e88b36ed3d7d76c5afc40ce2
This is Tuleap 7.5.99.68

Change-Id: I83ac024e71c7c37320daf9bde7bd5b5bb66f3b09
Merge commit 'refs/changes/20/3120/4' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #7437: replace global rank by N/A

Change-Id: Ib8c580506f7072afc979878a6441fba80f15e95f
s is Tuleap 7.5.99.69

Change-Id: If63cbe6f55f497db43ccb9d70a6e6220ef5f0557