[hts_open,bgzf,vcf] New flags for uncompressed input/output to distinguish between compressed/uncompressed BCF/VCF. Updates and fixes in BCF update functions. Removed old tests (now in samtools/bcftools repo) and added new.
Resolved merge conflict in Makefile, merged.
vcf.h: Reverted back to bcf_float_is_* macros as the inlined unions break vcfmerge code, found a solution with the original version.