Adding GWAS summary statistics QC as flag to study level QC

[addramir]

I suggest to add the QC flag(s) to study index after GWAS QC. A bit unclear how it interferes with other steps in GWAS catalog processing tho.

[addramir]

After discussions:

• [ ] Add QC flags to study validation
• [ ] Add the filtering to fine_mapper based on QC log file