synced_reader: Init position correctly
Merge branch 'develop' into bcftools+calling
Merge branch 'develop' into bcftools+calling
Merge branch 'bcftools+calling' into develop
Make hfile.h part of the public API
Add MIT/Expat license boilerplate

As noted in the copyright notices, these files are recent additions and
have been contributed to solely by GRL.  So their provenance is clear.
Define __attribute__ macros in a new (semi-public) header