slapos_accounting: better invoice view

4 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS.Eggs.UnitTest-Master.Python2

00:22:56

passed SlapOS.Eggs.UnitTest-Master.Python3

00:57:45

passed SlapOS.Eggs.UnitTest-Master.Python2

00:19:43

passed SlapOS.Eggs.UnitTest-Master.Python3

00:21:23