extract snps from vcf
fix bugs and add comments
change $gq_min to 13
identify parent and write polymorphism files
fork properly
print truncated lines in log for het regions that get filtered out
include all het regions in snp files (temporary change for testing method)
Revert "include all het regions in snp files (temporary change for testing method)"

This reverts commit 47ef89d815cfd2b43204a97e416c1fb66bb3b020.
Merge branch 'feature/extract-snps-from-good-merged-vcf' into develop
Use Log::Reproducible
Refactor sample # calculation
Summarize multiple VCF files in single run
Tidy up following indent for for loop
Summarize VCF files in parallel
Remove redundant dp4_counter() calls
Avoid warning: 'keys on reference is experimental'
Avoid illegal division by zero
Access @ARGV after GetOptions
Add compatibility info for samtools 0.1.18 vs 0.1.19
Merge branch 'release/0.2.0'