added cseries_get_freq_group function
added cseries_get_freq_group function

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,surhudm/scipy,FRidh/scipy,Newman101/scipy,perimosocordiae/scipy,behzadnouri/scipy,pschella/scipy,nmayorov/scipy,maniteja123/scipy,lukauskas/scipy,andyfaff/scipy,lukauskas/scipy,mingwpy/scipy,rgommers/scipy,rmcgibbo/scipy,sriki18/scipy,grlee77/scipy,minhlongdo/scipy,mikebenfield/scipy,e-q/scipy,pizzathief/scipy,fredrikw/scipy,behzadnouri/scipy,woodscn/scipy,gertingold/scipy,aman-iitj/scipy,mortonjt/scipy,mingwpy/scipy,cpaulik/scipy,Shaswat27/scipy,maniteja123/scipy,apbard/scipy,giorgiop/scipy,newemailjdm/scipy,haudren/scipy,aarchiba/scipy,argriffing/scipy,matthew-brett/scipy,haudren/scipy,Kamp9/scipy,larsmans/scipy,perimosocordiae/scipy,juliantaylor/scipy,e-q/scipy,pnedunuri/scipy,Stefan-Endres/scipy,sargas/scipy,sauliusl/scipy,vberaudi/scipy,kalvdans/scipy,cpaulik/scipy,andyfaff/scipy,Srisai85/scipy,felipebetancur/scipy,ChanderG/scipy,aeklant/scipy,ilayn/scipy,behzadnouri/scipy,andim/scipy,maciejkula/scipy,minhlongdo/scipy,fernand/scipy,kalvdans/scipy,dominicelse/scipy,Shaswat27/scipy,WarrenWeckesser/scipy,newemailjdm/scipy,futurulus/scipy,felipebetancur/scipy,pnedunuri/scipy,mdhaber/scipy,ndchorley/scipy,jor-/scipy,gertingold/scipy,arokem/scipy,ogrisel/scipy,gdooper/scipy,zaxliu/scipy,vanpact/scipy,Gillu13/scipy,pbrod/scipy,arokem/scipy,rgommers/scipy,Gillu13/scipy,zerothi/scipy,trankmichael/scipy,sauliusl/scipy,dch312/scipy,zxsted/scipy,kleskjr/scipy,Eric89GXL/scipy,Newman101/scipy,apbard/scipy,minhlongdo/scipy,mortada/scipy,chatcannon/scipy,mingwpy/scipy,matthew-brett/scipy,bkendzior/scipy,Srisai85/scipy,scipy/scipy,argriffing/scipy,jjhelmus/scipy,josephcslater/scipy,mgaitan/scipy,kalvdans/scipy,josephcslater/scipy,piyush0609/scipy,dominicelse/scipy,argriffing/scipy,endolith/scipy,njwilson23/scipy,aman-iitj/scipy,person142/scipy,aeklant/scipy,pnedunuri/scipy,gfyoung/scipy,sargas/scipy,jsilter/scipy,WillieMaddox/scipy,jor-/scipy,Newman101/scipy,mdhaber/scipy,futurulus/scipy,mhogg/scipy,zaxliu/scipy,zerothi/scipy,jamestwebber/scipy,andyfaff/scipy,aeklant/scipy,sriki18/scipy,endolith/scipy,mgaitan/scipy,endolith/scipy,rmcgibbo/scipy,nvoron23/scipy,mdhaber/scipy,nonhermitian/scipy,pbrod/scipy,Srisai85/scipy,Srisai85/scipy,jonycgn/scipy,kleskjr/scipy,vberaudi/scipy,zaxliu/scipy,zxsted/scipy,sauliusl/scipy,anielsen001/scipy,piyush0609/scipy,sonnyhu/scipy,jakevdp/scipy,efiring/scipy,mgaitan/scipy,newemailjdm/scipy,pnedunuri/scipy,perimosocordiae/scipy,sriki18/scipy,vberaudi/scipy,Dapid/scipy,cpaulik/scipy,gfyoung/scipy,Shaswat27/scipy,gfyoung/scipy,jonycgn/scipy,aman-iitj/scipy,aman-iitj/scipy,sauliusl/scipy,nonhermitian/scipy,nmayorov/scipy,rmcgibbo/scipy,Dapid/scipy,hainm/scipy,Kamp9/scipy,e-q/scipy,ChanderG/scipy,WarrenWeckesser/scipy,jakevdp/scipy,futurulus/scipy,pyramania/scipy,mortada/scipy,pnedunuri/scipy,sauliusl/scipy,FRidh/scipy,pschella/scipy,Dapid/scipy,larsmans/scipy,ales-erjavec/scipy,zerothi/scipy,bkendzior/scipy,endolith/scipy,zxsted/scipy,befelix/scipy,person142/scipy,fernand/scipy,maciejkula/scipy,sriki18/scipy,jor-/scipy,befelix/scipy,apbard/scipy,kleskjr/scipy,fernand/scipy,arokem/scipy,larsmans/scipy,matthew-brett/scipy,mortonjt/scipy,scipy/scipy,nvoron23/scipy,witcxc/scipy,petebachant/scipy,lhilt/scipy,sauliusl/scipy,woodscn/scipy,mhogg/scipy,minhlongdo/scipy,gef756/scipy,felipebetancur/scipy,chatcannon/scipy,argriffing/scipy,josephcslater/scipy,teoliphant/scipy,vberaudi/scipy,sonnyhu/scipy,petebachant/scipy,jsilter/scipy,niknow/scipy,aarchiba/scipy,pyramania/scipy,surhudm/scipy,WillieMaddox/scipy,jsilter/scipy,dch312/scipy,vigna/scipy,jseabold/scipy,richardotis/scipy,andyfaff/scipy,anielsen001/scipy,mhogg/scipy,giorgiop/scipy,jjhelmus/scipy,ortylp/scipy,nmayorov/scipy,vanpact/scipy,WillieMaddox/scipy,aeklant/scipy,pizzathief/scipy,vhaasteren/scipy,Kamp9/scipy,jseabold/scipy,aarchiba/scipy,arokem/scipy,witcxc/scipy,zerothi/scipy,jonycgn/scipy,pbrod/scipy,lhilt/scipy,bkendzior/scipy,ogrisel/scipy,njwilson23/scipy,woodscn/scipy,maniteja123/scipy,futurulus/scipy,hainm/scipy,vhaasteren/scipy,FRidh/scipy,tylerjereddy/scipy,dch312/scipy,jseabold/scipy,jamestwebber/scipy,mortada/scipy,richardotis/scipy,Eric89GXL/scipy,chatcannon/scipy,petebachant/scipy,rmcgibbo/scipy,jamestwebber/scipy,anielsen001/scipy,andim/scipy,arokem/scipy,andyfaff/scipy,piyush0609/scipy,juliantaylor/scipy,pschella/scipy,person142/scipy,bkendzior/scipy,fredrikw/scipy,anntzer/scipy,jsilter/scipy,perimosocordiae/scipy,futurulus/scipy,larsmans/scipy,haudren/scipy,e-q/scipy,mhogg/scipy,jamestwebber/scipy,endolith/scipy,grlee77/scipy,ilayn/scipy,Kamp9/scipy,sargas/scipy,ales-erjavec/scipy,lukauskas/scipy,gdooper/scipy,chatcannon/scipy,fernand/scipy,andim/scipy,hainm/scipy,newemailjdm/scipy,efiring/scipy,fredrikw/scipy,ogrisel/scipy,josephcslater/scipy,zaxliu/scipy,vanpact/scipy,witcxc/scipy,endolith/scipy