index: Check return status of bcf_index_build()
call: Trio constrained calling (no sex chromosomes yet)
call: Original bcftools' -c calling now functional
som: Major rewrite, evaluation not dependent on ts/tv any more. The current version does not work with VCFs, tab-delimited files only.
All tools: Do not access bcf1_t's var_type directly, use bcf_get_variant_types instead.
call: New type of constrained calling - genotypes given alleles