make `setxor1d' a bit clear and speed up
make `setxor1d' a bit clear and speed up

We need to find the index which is not the same with the left and right, I think np.logical_and's meaning is more clear and I test this got a speed up
jakirkham/numpy,pbrod/numpy,grlee77/numpy,endolith/numpy,grlee77/numpy,jorisvandenbossche/numpy,madphysicist/numpy,mhvk/numpy,MSeifert04/numpy,MSeifert04/numpy,jakirkham/numpy,madphysicist/numpy,shoyer/numpy,mattip/numpy,Eric89GXL/numpy,pizzathief/numpy,anntzer/numpy,jorisvandenbossche/numpy,ahaldane/numpy,grlee77/numpy,abalkin/numpy,MSeifert04/numpy,WarrenWeckesser/numpy,rgommers/numpy,endolith/numpy,tynn/numpy,pdebuyl/numpy,pizzathief/numpy,jorisvandenbossche/numpy,solarjoe/numpy,endolith/numpy,grlee77/numpy,b-carter/numpy,seberg/numpy,pbrod/numpy,mattip/numpy,simongibbons/numpy,jorisvandenbossche/numpy,gfyoung/numpy,mhvk/numpy,pbrod/numpy,WarrenWeckesser/numpy,seberg/numpy,jakirkham/numpy,seberg/numpy,simongibbons/numpy,pdebuyl/numpy,grlee77/numpy,charris/numpy,charris/numpy,WarrenWeckesser/numpy,endolith/numpy,anntzer/numpy,MSeifert04/numpy,anntzer/numpy,mattip/numpy,ahaldane/numpy,shoyer/numpy,seberg/numpy,jakirkham/numpy,madphysicist/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy,b-carter/numpy,pdebuyl/numpy,ahaldane/numpy,gfyoung/numpy,anntzer/numpy,numpy/numpy,pizzathief/numpy,numpy/numpy,madphysicist/numpy,pbrod/numpy,pbrod/numpy,shoyer/numpy,simongibbons/numpy,b-carter/numpy,WarrenWeckesser/numpy,abalkin/numpy,Eric89GXL/numpy,pizzathief/numpy,mhvk/numpy,jakirkham/numpy,rgommers/numpy,mhvk/numpy,abalkin/numpy,madphysicist/numpy,simongibbons/numpy,pdebuyl/numpy,charris/numpy,ahaldane/numpy,simongibbons/numpy,rgommers/numpy,gfyoung/numpy,shoyer/numpy,mattip/numpy,ahaldane/numpy,Eric89GXL/numpy,tynn/numpy,pizzathief/numpy,Eric89GXL/numpy,tynn/numpy,shoyer/numpy,numpy/numpy,rgommers/numpy,MSeifert04/numpy,mhvk/numpy,numpy/numpy,charris/numpy,solarjoe/numpy,solarjoe/numpy