Clarify column iterator usage
Clarify column iterator usage

getColumnIterator expects position in sequence coordinates (genome coordinates if the sequence is a genome), but ColumnIterator->toSite expects the position exclusively in genome coordinates.
glennhickey/hal,glennhickey/hal,glennhickey/hal,glennhickey/hal,glennhickey/hal,glennhickey/hal,glennhickey/hal,glennhickey/hal