GAF list meta data
Change name GAF list entity
Fix tests
GAF list from omx to emx convert
Some improvements:

* Message when internalSampleId already exists
* Code improvements
Merge branch 'master' of github.com:molgenis/molgenis into feature/gaf_list_importer_#2613
Merge pull request #2116 from jjettenn/feature/gaf_list_importer_#2613

Feature/gaf list importer #2613