make sure we don't have fractional `start` or `end` in WiggleBase getRegionStats calls when figuring out local autoscaling.  just in case.
make sure we don't have fractional `start` or `end` in WiggleBase
getRegionStats calls when figuring out local autoscaling.  just in
case.

limeng12/jbrowse,GMOD/jbrowse,GMOD/jbrowse,limeng12/jbrowse,erasche/jbrowse,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,Arabidopsis-Information-Portal/jbrowse,erasche/jbrowse,erasche/jbrowse,erasche/jbrowse,limeng12/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,igemsoftware/Shenzhen_BGIC_0101_2013,igemsoftware/Shenzhen_BGIC_0101_2013,nathandunn/jbrowse,Arabidopsis-Information-Portal/jbrowse,Arabidopsis-Information-Portal/jbrowse,erasche/jbrowse,nathandunn/jbrowse,nathandunn/jbrowse,Arabidopsis-Information-Portal/jbrowse,GMOD/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,igemsoftware/Shenzhen_BGIC_0101_2013,limeng12/jbrowse,Arabidopsis-Information-Portal/jbrowse,limeng12/jbrowse,nathandunn/jbrowse,limeng12/jbrowse,erasche/jbrowse,GMOD/jbrowse,nathandunn/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,igemsoftware/Shenzhen_BGIC_0101_2013,limeng12/jbrowse,erasche/jbrowse,GMOD/jbrowse,limeng12/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,Arabidopsis-Information-Portal/jbrowse