MAINT: stats: make pickling and freezing keep track of _ctor_param
MAINT: stats: make pickling and freezing keep track of _ctor_param

Some of these can be changed by a user (unlikely but technically possible.)
Hence keep the originals *and* update them with current values
when pickling or freezing.

bkendzior/scipy,mdhaber/scipy,Newman101/scipy,grlee77/scipy,niknow/scipy,gertingold/scipy,anntzer/scipy,scipy/scipy,ilayn/scipy,pizzathief/scipy,aarchiba/scipy,befelix/scipy,jor-/scipy,Stefan-Endres/scipy,dominicelse/scipy,gdooper/scipy,sriki18/scipy,Gillu13/scipy,apbard/scipy,larsmans/scipy,kalvdans/scipy,andyfaff/scipy,zerothi/scipy,argriffing/scipy,grlee77/scipy,scipy/scipy,scipy/scipy,person142/scipy,Eric89GXL/scipy,matthewalbani/scipy,Stefan-Endres/scipy,Shaswat27/scipy,perimosocordiae/scipy,haudren/scipy,aeklant/scipy,pschella/scipy,Newman101/scipy,jjhelmus/scipy,befelix/scipy,matthew-brett/scipy,e-q/scipy,gfyoung/scipy,person142/scipy,Shaswat27/scipy,Newman101/scipy,gdooper/scipy,lhilt/scipy,kleskjr/scipy,josephcslater/scipy,dominicelse/scipy,ilayn/scipy,jakevdp/scipy,jjhelmus/scipy,Gillu13/scipy,anielsen001/scipy,kleskjr/scipy,endolith/scipy,gfyoung/scipy,gfyoung/scipy,josephcslater/scipy,woodscn/scipy,larsmans/scipy,argriffing/scipy,anielsen001/scipy,WarrenWeckesser/scipy,gertingold/scipy,andyfaff/scipy,perimosocordiae/scipy,nonhermitian/scipy,zerothi/scipy,pyramania/scipy,josephcslater/scipy,haudren/scipy,matthew-brett/scipy,gertingold/scipy,tylerjereddy/scipy,pbrod/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,chatcannon/scipy,jor-/scipy,woodscn/scipy,ilayn/scipy,surhudm/scipy,matthewalbani/scipy,jamestwebber/scipy,maniteja123/scipy,larsmans/scipy,Eric89GXL/scipy,gfyoung/scipy,anntzer/scipy,nonhermitian/scipy,jakevdp/scipy,rgommers/scipy,arokem/scipy,kalvdans/scipy,surhudm/scipy,dominicelse/scipy,Gillu13/scipy,ilayn/scipy,Shaswat27/scipy,anntzer/scipy,jjhelmus/scipy,pyramania/scipy,Stefan-Endres/scipy,apbard/scipy,zerothi/scipy,rgommers/scipy,gdooper/scipy,kleskjr/scipy,behzadnouri/scipy,mikebenfield/scipy,kalvdans/scipy,maniteja123/scipy,argriffing/scipy,sriki18/scipy,Stefan-Endres/scipy,grlee77/scipy,Shaswat27/scipy,rgommers/scipy,bkendzior/scipy,aeklant/scipy,lhilt/scipy,aeklant/scipy,person142/scipy,pizzathief/scipy,jakevdp/scipy,anntzer/scipy,haudren/scipy,jamestwebber/scipy,bkendzior/scipy,zerothi/scipy,surhudm/scipy,nmayorov/scipy,andyfaff/scipy,scipy/scipy,nmayorov/scipy,woodscn/scipy,anntzer/scipy,dominicelse/scipy,anielsen001/scipy,pbrod/scipy,haudren/scipy,pbrod/scipy,josephcslater/scipy,niknow/scipy,zerothi/scipy,matthewalbani/scipy,arokem/scipy,gertingold/scipy,befelix/scipy,apbard/scipy,woodscn/scipy,Gillu13/scipy,mdhaber/scipy,vigna/scipy,endolith/scipy,WarrenWeckesser/scipy,jjhelmus/scipy,sriki18/scipy,niknow/scipy,Newman101/scipy,matthewalbani/scipy,e-q/scipy,sriki18/scipy,mikebenfield/scipy,ilayn/scipy,niknow/scipy,surhudm/scipy,behzadnouri/scipy,grlee77/scipy,jamestwebber/scipy,pizzathief/scipy,pbrod/scipy,surhudm/scipy,pschella/scipy,person142/scipy,rgommers/scipy,endolith/scipy,mdhaber/scipy,anielsen001/scipy,behzadnouri/scipy,surhudm/scipy,jakevdp/scipy,jor-/scipy,kleskjr/scipy,jakevdp/scipy,argriffing/scipy,chatcannon/scipy,mdhaber/scipy,anntzer/scipy,kleskjr/scipy,Newman101/scipy,pschella/scipy,sriki18/scipy,pizzathief/scipy,Eric89GXL/scipy,person142/scipy,pyramania/scipy,chatcannon/scipy,maniteja123/scipy,pyramania/scipy,kalvdans/scipy,nmayorov/scipy,dominicelse/scipy,mikebenfield/scipy,mikebenfield/scipy,gdooper/scipy,matthew-brett/scipy,maniteja123/scipy,lhilt/scipy,larsmans/scipy,vigna/scipy,befelix/scipy,Eric89GXL/scipy,matthew-brett/scipy,jor-/scipy,Shaswat27/scipy,e-q/scipy,e-q/scipy,kleskjr/scipy,vigna/scipy,WarrenWeckesser/scipy,bkendzior/scipy,behzadnouri/scipy,tylerjereddy/scipy,e-q/scipy,nonhermitian/scipy,arokem/scipy,nonhermitian/scipy,Shaswat27/scipy,behzadnouri/scipy,endolith/scipy,larsmans/scipy,Eric89GXL/scipy,aarchiba/scipy,arokem/scipy,chatcannon/scipy,gdooper/scipy,perimosocordiae/scipy,grlee77/scipy,bkendzior/scipy,mikebenfield/scipy,perimosocordiae/scipy,chatcannon/scipy,endolith/scipy,aeklant/scipy,niknow/scipy,pschella/scipy,niknow/scipy,aeklant/scipy,scipy/scipy,pizzathief/scipy,nonhermitian/scipy,vigna/scipy,woodscn/scipy,endolith/scipy,apbard/scipy,tylerjereddy/scipy,WarrenWeckesser/scipy,WarrenWeckesser/scipy,Gillu13/scipy,pschella/scipy,kalvdans/scipy,tylerjereddy/scipy,mdhaber/scipy,arokem/scipy,josephcslater/scipy,lhilt/scipy,andyfaff/scipy,ilayn/scipy,lhilt/scipy,Stefan-Endres/scipy,andyfaff/scipy,matthew-brett/scipy,jjhelmus/scipy,gertingold/scipy,vigna/scipy,Gillu13/scipy,Newman101/scipy,haudren/scipy,gfyoung/scipy,anielsen001/scipy,matthewalbani/scipy,larsmans/scipy,argriffing/scipy,argriffing/scipy,woodscn/scipy,aarchiba/scipy,nmayorov/scipy,haudren/scipy,perimosocordiae/scipy,chatcannon/scipy,pbrod/scipy,scipy/scipy,apbard/scipy,befelix/scipy,sriki18/scipy,maniteja123/scipy,aarchiba/scipy,aarchiba/scipy,jamestwebber/scipy,tylerjereddy/scipy,mdhaber/scipy,anielsen001/scipy,jor-/scipy,rgommers/scipy,behzadnouri/scipy,maniteja123/scipy,zerothi/scipy,jamestwebber/scipy,pyramania/scipy,Eric89GXL/scipy,Stefan-Endres/scipy,pbrod/scipy,andyfaff/scipy,nmayorov/scipy