py bindings -- add more usage help and unbiased timings to autotuner
py bindings -- add more usage help and unbiased timings to autotuner

tdenniston/Halide,fengzhyuan/Halide,smxlong/Halide,rodrigob/Halide,rodrigob/Halide,damienfir/Halide,damienfir/Halide,dan-tull/Halide,smxlong/Halide,ronen/Halide,fengzhyuan/Halide,rodrigob/Halide,ronen/Halide,aam/Halide,ayanazmat/Halide,rodrigob/Halide,dan-tull/Halide,tdenniston/Halide,dougkwan/Halide,ronen/Halide,gchauras/Halide,kgnk/Halide,kenkuang1213/Halide,aam/Halide,ronen/Halide,smxlong/Halide,aam/Halide,damienfir/Halide,dan-tull/Halide,jiawen/Halide,jiawen/Halide,tdenniston/Halide,mikeseven/Halide,tdenniston/Halide,damienfir/Halide,kenkuang1213/Halide,dougkwan/Halide,adasworks/Halide,lglucin/Halide,ronen/Halide,kenkuang1213/Halide,rodrigob/Halide,dougkwan/Halide,ronen/Halide,kgnk/Halide,delcypher/Halide,lglucin/Halide,ayanazmat/Halide,tdenniston/Halide,mikeseven/Halide,jiawen/Halide,aam/Halide,fengzhyuan/Halide,rodrigob/Halide,fengzhyuan/Halide,aam/Halide,mcanthony/Halide,lglucin/Halide,delcypher/Halide,myrtleTree33/Halide,fengzhyuan/Halide,kgnk/Halide,dougkwan/Halide,myrtleTree33/Halide,mcanthony/Halide,smxlong/Halide,adasworks/Halide,tdenniston/Halide,mcanthony/Halide,dan-tull/Halide,fengzhyuan/Halide,lglucin/Halide,rodrigob/Halide,jiawen/Halide,psuriana/Halide,kenkuang1213/Halide,kgnk/Halide,damienfir/Halide,ayanazmat/Halide,ayanazmat/Halide,psuriana/Halide,psuriana/Halide,smxlong/Halide,adasworks/Halide,adasworks/Halide,dougkwan/Halide,tdenniston/Halide,dan-tull/Halide,kenkuang1213/Halide,smxlong/Halide,myrtleTree33/Halide,gchauras/Halide,ayanazmat/Halide,damienfir/Halide,smxlong/Halide,myrtleTree33/Halide,delcypher/Halide,psuriana/Halide,mcanthony/Halide,ronen/Halide,gchauras/Halide,adasworks/Halide,adasworks/Halide,adasworks/Halide,gchauras/Halide,delcypher/Halide,damienfir/Halide,dougkwan/Halide,dan-tull/Halide,lglucin/Halide,dan-tull/Halide,mikeseven/Halide,dan-tull/Halide,damienfir/Halide,kenkuang1213/Halide,lglucin/Halide,psuriana/Halide,dougkwan/Halide,kgnk/Halide,adasworks/Halide,delcypher/Halide,ayanazmat/Halide,ayanazmat/Halide,kgnk/Halide,delcypher/Halide,mikeseven/Halide,gchauras/Halide,fengzhyuan/Halide,psuriana/Halide,lglucin/Halide,myrtleTree33/Halide,aam/Halide,rodrigob/Halide,smxlong/Halide,ayanazmat/Halide,fengzhyuan/Halide,tdenniston/Halide,myrtleTree33/Halide,aam/Halide,kgnk/Halide,ronen/Halide,jiawen/Halide,delcypher/Halide,myrtleTree33/Halide,jiawen/Halide,psuriana/Halide,mcanthony/Halide,dougkwan/Halide,gchauras/Halide,delcypher/Halide,myrtleTree33/Halide,mcanthony/Halide,kenkuang1213/Halide,mcanthony/Halide,mikeseven/Halide,kenkuang1213/Halide,kgnk/Halide,jiawen/Halide,mcanthony/Halide