-Only works with single-sample vcfs
-As with bams, the user must provide a file mapping the absolute path to
each vcf whose samples are to be renamed to the new sample name for that
vcf. The argument is the same as for bams: --sample_rename_mapping_file,
and the mapping file may contain a mix of bam and vcf files should the
user wish.
-It's an error to attempt to remap the sample names of a multi-sample
or sites-only vcf
-Implemented at the codec level at the instant the vcf header is first
read in to minimize the chances of downstream code examining vcf
headers/records before renaming occurs.
-Integration tests are in sting, unit tests are in picard
-Rev picard et. al. to 1.111.1902
David Roazen