make user css config var able to understand regular strings as URLs (can distinguish URLs from CSS statements by the presence or absence of "{"), and add a data-from="JBrowse Config" attr to html elements inserted as a result of user config.
make user css config var able to understand regular strings as URLs (can distinguish URLs from CSS statements by the presence or absence of "{"), and add a data-from="JBrowse Config" attr to html elements inserted as a result of user config.

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