Stop use of mr.developer (source available on git now).

Use relative paths. Cleanup.
7 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed Cloudooo.UnitTest-Master

00:06:20

passed SlapOS.Eggs.UnitTest-Master.Python2

00:13:05

passed SlapOS.Eggs.UnitTest-Master.Python3

00:12:31

passed SlapOS.SlapRunner.ResilienceTest-Master

00:23:46

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

01:30:55

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

05:13:18

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

04:06:11