vcf: Support for regions in the form chr|chr:pos|chr:from-to|chr:from-
tbx: Sanity check if the file type meets the expectation, detect non-numeric fields
hts_idx: check return status of bgzf_read
bcf reader: Fix in chr:pos type of regions
synced reader: Support for BED regions/target files
synced reader: regions and targets now support VCF; Fix for match_alleles by reverting 0-terminating chr modification
synced reader: Give a hint when tabix was used with wrong column indexes for regions/targets