[FIX] Gustaf: wrong chrID in vcf out for multiple references
[TEST] Gustaf: added test for multiple references
[FIX] Removing double-adding of sequence names again.
Merge pull request #1 from holtgrewe/fix/gustaf_vcf_bug

[FIX] Removing double-adding of sequence names again.
Merge pull request #461 from ktrappe/fix/gustaf_vcf_bug

[FIX] Gustaf: wrong chrID in vcf out for multiple references