simplify IE special-casing of position-setting methods and take most of them out of the GenomeView constructor
simplify IE special-casing of position-setting methods and take most
of them out of the GenomeView constructor

nathandunn/jbrowse,SuLab/jbrowse,limeng12/jbrowse,SuLab/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,limeng12/jbrowse,Arabidopsis-Information-Portal/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,igemsoftware/Shenzhen_BGIC_0101_2013,GreggHelt2/apollo-test,erasche/jbrowse,GreggHelt2/apollo-test,Arabidopsis-Information-Portal/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,igemsoftware/Shenzhen_BGIC_0101_2013,SuLab/jbrowse,Arabidopsis-Information-Portal/jbrowse,limeng12/jbrowse,limeng12/jbrowse,Arabidopsis-Information-Portal/jbrowse,GreggHelt2/apollo-test,Arabidopsis-Information-Portal/jbrowse,SuLab/jbrowse,nathandunn/jbrowse,limeng12/jbrowse,erasche/jbrowse,erasche/jbrowse,GMOD/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,nathandunn/jbrowse,GMOD/jbrowse,GMOD/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,nathandunn/jbrowse,nathandunn/jbrowse,limeng12/jbrowse,GreggHelt2/apollo-test,SuLab/jbrowse,limeng12/jbrowse,erasche/jbrowse,erasche/jbrowse,GMOD/jbrowse,GMOD/jbrowse,SuLab/jbrowse,erasche/jbrowse,igemsoftware/Shenzhen_BGIC_0101_2013,Arabidopsis-Information-Portal/jbrowse,SuLab/jbrowse,erasche/jbrowse,GreggHelt2/apollo-test,GreggHelt2/apollo-test,GreggHelt2/apollo-test,erasche/jbrowse,Arabidopsis-Information-Portal/jbrowse,limeng12/jbrowse