some pep8 fixes
typo fixed
update draw_snv_stats: added max_depth to depth distrib
added histogram for snp qualities
Merge branch 'master' of ssh://proxybioinf.comav.upv.es:2203/vcf_crumbs
Merge branch 'master' of ssh://proxybioinf.comav.upv.es:2203/vcf_crumbs
todo created