Merging postreleasefix/88 to master
Merging postreleasefix/88 to master

* postreleasefix/88:
  Use fixed branch of htslib to avoid lzma, bz2 dependency

Ensembl/ensembl-variation,willmclaren/ensembl-variation,Ensembl/ensembl-variation,willmclaren/ensembl-variation,Ensembl/ensembl-variation,willmclaren/ensembl-variation,Ensembl/ensembl-variation,willmclaren/ensembl-variation,willmclaren/ensembl-variation,Ensembl/ensembl-variation