- refactor knox for large samples
- refactor knox for large samples

pysal/pysal,pastephens/pysal,chhao91/pysal,dfolch/pysal,weikang9009/pysal,schmidtc/pysal,TaylorOshan/pysal,sjsrey/pysal,darribas/pysal,sjsrey/pysal_core,dfolch/pysal,jlaura/pysal,lixun910/pysal,hasecbinusr/pysal,lixun910/pysal,TaylorOshan/pysal,badjr/pysal,badjr/pysal,nathania/pysal,jlaura/pysal,sjsrey/pysal_core,darribas/pysal,schmidtc/pysal,nathania/pysal,hasecbinusr/pysal,jlaura/pysal,ljwolf/pysal_core,pedrovma/pysal,chhao91/pysal,spreg-git/pysal,sjsrey/pysal_core,ljwolf/pysal,ljwolf/pysal,TaylorOshan/pysal,ljwolf/pysal_core,ljwolf/pysal,spreg-git/pysal,hasecbinusr/pysal,ljwolf/pysal_core,pastephens/pysal,pastephens/pysal,lanselin/pysal,lixun910/pysal