remove now-unused --thresh option from generate-names.pl docs, but keep it in the argument parsing for backcompat
remove now-unused --thresh option from generate-names.pl docs, but keep it in the argument parsing for backcompat

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