ancestry_supop is the tables with the users ancestry makeup in the super population code from a1000 genomes project
The * means that there is no corresponding data for that sample.
The Variant Call Format (VCF) is a text file that contains variant data about the genome.
BCF, or the binary variant call format, is the binary version of VCF. And is used to generally process the file faster.
Run the following commands to get bcftools:
$ git clone --branch=develop git://github.com/samtools/htslib.git
$ git clone --branch=develop git://github.com/samtools/bcftools.git
$ git clone --branch=develop git://github.com/samtools/samtools.git
$ cd bcftools; make
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