allow end-trimming in tabulate script to avoid bias
allow end-trimming in tabulate script to avoid bias

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