Retrieve and use bgzip compressed reference human genome fasta for preprocessor

[BinglanLi]

• Do you want to request a feature or report a bug?

feature for preprocessor

• What is the current behavior?

Preprocessor downloads and decompresses the gzip compressed fasta file of reference human genome from NCBI website.

• What is the expected behavior?

Retrieve the bgzip compressed fasta file and its index files from https://github.com/PharmGKB/PharmCAT-data instead.

• What is the motivation / use case for changing the behavior?

The feature will allow PharmCAT users to use a compressed reference human genome sequence for VCF normalization. It provides computer storage friendly files, reduces download time and improves preprocessing speed for PharmCAT users.

[markwoon]

done