bgzf: Write plain gzip files if is_gzip set
bgzf_open(..,"g") for compressed gzip output, as opposed to BGZF
Don't install libhts.so.1 as a man page
Release 1.1: various minor bug fixes
Merge version number bump from master
Added regidx API which should replace bcf_sr_regions at some point
Clean after regidx init failure; fixed build dependencies