Added retroactive dependencies between the legacy targets.

Added retroactive dependencies between the legacy targets.

bug uuid                              created    resolved   target
ee681951-f254-43d3-a53a-1b36ae415d5c  revno: 45  revno: 51  patch-52
f51dc5a7-37b7-4ce1-859a-b7cb58be6494  revno: 41  revno: 41  0.1
f5c06914-dc64-4658-8ec7-32a026a53f55  revno: 45  revno: 93  0.2

reasonable target blockage:
  0.1 ------------| 0.2
     `-| patch-52 --|

Here are the old targets
  $ be list --severity target --status all
  4fc:ct: patch-52
  47c:ft: 0.1
  bd0:ft: 0.2
And here is the implemented dependency tree
  $ be depend -t -1 bd0
  bd0ebb56-fb46-45bc-af08-1e4a94e8ef3c blocked by:
   47c:ft: 0.1
    f51:ff: Can't create bugs
   4fc:ct: patch-52
    47c:ft: 0.1
     f51:ff: Can't create bugs
    ee6:cm: Support rcs configuration
   f5c:fm: Implement bug tree diff