TColorGradient and other gradients: Demote class version to 0.
TColorGradient and other gradients: Demote class version to 0.

These can't be streamed, they contain a struct "Point" which has no ClassDef, e.g.:
Warning in <TStreamerInfo::Build>: TLinearGradient: TColorGradient::Point has no streamer or dictionary, data member "fStart" will not be saved

Signed-off-by: Oliver Freyermuth <297815a44ac0d229e08a814adf0f210787d04d87@googlemail.com>

agarciamontoro/root,veprbl/root,lgiommi/root,BerserkerTroll/root,CristinaCristescu/root,mhuwiler/rootauto,sawenzel/root,davidlt/root,georgtroska/root,lgiommi/root,simonpf/root,buuck/root,zzxuanyuan/root-compressor-dummy,veprbl/root,BerserkerTroll/root,zzxuanyuan/root,sawenzel/root,abhinavmoudgil95/root,buuck/root,Y--/root,root-mirror/root,zzxuanyuan/root,CristinaCristescu/root,mhuwiler/rootauto,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,mhuwiler/rootauto,pspe/root,gganis/root,mhuwiler/rootauto,lgiommi/root,zzxuanyuan/root-compressor-dummy,veprbl/root,Y--/root,lgiommi/root,simonpf/root,thomaskeck/root,sawenzel/root,thomaskeck/root,Y--/root,CristinaCristescu/root,agarciamontoro/root,buuck/root,beniz/root,sawenzel/root,root-mirror/root,georgtroska/root,simonpf/root,simonpf/root,gbitzes/root,karies/root,olifre/root,pspe/root,lgiommi/root,zzxuanyuan/root,BerserkerTroll/root,zzxuanyuan/root,buuck/root,buuck/root,pspe/root,zzxuanyuan/root-compressor-dummy,pspe/root,olifre/root,pspe/root,BerserkerTroll/root,buuck/root,satyarth934/root,veprbl/root,pspe/root,root-mirror/root,Y--/root,abhinavmoudgil95/root,agarciamontoro/root,gganis/root,gganis/root,veprbl/root,CristinaCristescu/root,davidlt/root,lgiommi/root,pspe/root,buuck/root,BerserkerTroll/root,satyarth934/root,mhuwiler/rootauto,root-mirror/root,bbockelm/root,thomaskeck/root,gganis/root,karies/root,zzxuanyuan/root,olifre/root,karies/root,root-mirror/root,thomaskeck/root,davidlt/root,abhinavmoudgil95/root,veprbl/root,sawenzel/root,beniz/root,buuck/root,abhinavmoudgil95/root,CristinaCristescu/root,zzxuanyuan/root-compressor-dummy,abhinavmoudgil95/root,davidlt/root,gganis/root,georgtroska/root,thomaskeck/root,thomaskeck/root,bbockelm/root,bbockelm/root,gganis/root,karies/root,mhuwiler/rootauto,BerserkerTroll/root,zzxuanyuan/root-compressor-dummy,olifre/root,beniz/root,gbitzes/root,CristinaCristescu/root,davidlt/root,satyarth934/root,mhuwiler/rootauto,root-mirror/root,zzxuanyuan/root-compressor-dummy,zzxuanyuan/root-compressor-dummy,simonpf/root,buuck/root,gbitzes/root,gbitzes/root,zzxuanyuan/root-compressor-dummy,agarciamontoro/root,zzxuanyuan/root-compressor-dummy,gbitzes/root,thomaskeck/root,mhuwiler/rootauto,Y--/root,davidlt/root,bbockelm/root,gganis/root,georgtroska/root,simonpf/root,gbitzes/root,beniz/root,satyarth934/root,mhuwiler/rootauto,agarciamontoro/root,olifre/root,Y--/root,veprbl/root,pspe/root,zzxuanyuan/root,thomaskeck/root,mhuwiler/rootauto,zzxuanyuan/root,root-mirror/root,zzxuanyuan/root,BerserkerTroll/root,georgtroska/root,gganis/root,buuck/root,satyarth934/root,karies/root,CristinaCristescu/root,veprbl/root,buuck/root,veprbl/root,satyarth934/root,zzxuanyuan/root,CristinaCristescu/root,pspe/root,beniz/root,abhinavmoudgil95/root,agarciamontoro/root,bbockelm/root,karies/root,thomaskeck/root,sawenzel/root,abhinavmoudgil95/root,bbockelm/root,davidlt/root,veprbl/root,root-mirror/root,satyarth934/root,olifre/root,lgiommi/root,mhuwiler/rootauto,gganis/root,root-mirror/root,Y--/root,Y--/root,beniz/root,simonpf/root,satyarth934/root,georgtroska/root,sawenzel/root,beniz/root,gganis/root,georgtroska/root,BerserkerTroll/root,lgiommi/root,sawenzel/root,zzxuanyuan/root,bbockelm/root,bbockelm/root,beniz/root,lgiommi/root,karies/root,olifre/root,abhinavmoudgil95/root,gbitzes/root,olifre/root,zzxuanyuan/root,georgtroska/root,BerserkerTroll/root,CristinaCristescu/root,karies/root,georgtroska/root,CristinaCristescu/root,davidlt/root,simonpf/root,sawenzel/root,gbitzes/root,georgtroska/root,olifre/root,beniz/root,lgiommi/root,georgtroska/root,gbitzes/root,olifre/root,Y--/root,davidlt/root,gbitzes/root,simonpf/root,root-mirror/root,satyarth934/root,olifre/root,simonpf/root,abhinavmoudgil95/root,agarciamontoro/root,bbockelm/root,karies/root,agarciamontoro/root,sawenzel/root,zzxuanyuan/root,simonpf/root,gbitzes/root,bbockelm/root,CristinaCristescu/root,lgiommi/root,beniz/root,zzxuanyuan/root-compressor-dummy,pspe/root,veprbl/root,root-mirror/root,beniz/root,agarciamontoro/root,karies/root,Y--/root,abhinavmoudgil95/root,thomaskeck/root,davidlt/root,BerserkerTroll/root,davidlt/root,bbockelm/root,Y--/root,karies/root,sawenzel/root,pspe/root,satyarth934/root,satyarth934/root,agarciamontoro/root,BerserkerTroll/root,abhinavmoudgil95/root,gganis/root