swap to relative tolerance in assertions
swap to relative tolerance in assertions

nathania/pysal,ljwolf/pysal_core,ljwolf/pysal,sjsrey/pysal,jlaura/pysal,ljwolf/pysal_core,ljwolf/pysal,weikang9009/pysal,jlaura/pysal,schmidtc/pysal,lixun910/pysal,TaylorOshan/pysal,lanselin/pysal,chhao91/pysal,chhao91/pysal,nathania/pysal,sjsrey/pysal_core,sjsrey/pysal_core,ljwolf/pysal,hasecbinusr/pysal,schmidtc/pysal,badjr/pysal,hasecbinusr/pysal,pysal/pysal,lixun910/pysal,hasecbinusr/pysal,sjsrey/pysal_core,pastephens/pysal,pastephens/pysal,ljwolf/pysal_core,TaylorOshan/pysal,badjr/pysal,pastephens/pysal,jlaura/pysal,lixun910/pysal,pedrovma/pysal,TaylorOshan/pysal