implement Yaping's suggestions for WGBS Bis-SNP
implement Yaping's suggestions for WGBS Bis-SNP

PeteHaitch/bwa-parclip,dariober/bwa-meth,PeteHaitch/bwa-parclip,dariober/bwa-meth,brentp/bwa-meth,PeteHaitch/bwa-parclip,dariober/bwa-meth,brentp/bwa-meth,brentp/bwa-meth