anchor.diff:  {
     "metadata": {},
     "parent": "MAIN/2015-01-31",
  -  "name": "SNOMEDCT-SV"
  +  "name": "SNOMEDCT-SE"
   }
   ....
   
  
positive.code: {
    "createVersions": true,
    "type": "FULL",
    "branchPath": "MAIN/2015-01-31/SNOMEDCT-SV",
    "codeSystemShortName": "SNOMEDCT-SV"
  }
  ....
  
  
negative.code: ....
  POST /snowowl/snomed-ct/v2/merges
  {
    "source": "MAIN/2015-01-31/SNOMEDCT-SE",
    "target": "MAIN/2016-01-31/SNOMEDCT-SE",
    "commitComment": "Upgrade Swedish extension to international version 2016-01-31"
  }
  ....
  