Add log files for tool runs.
Added more QC queries.

Also drilled down into some particulars of the dataset.
Delete data generated incorrectly.

It was not correct to merge gVCF files via bcftools and then use the merged result as input to vcftools, plink, and pseq.
Merge branch 'qc-codelab' of github.com:deflaux/codelabs into qc-codelab