change arc distance test to asser_allclose
change arc distance test to asser_allclose

ljwolf/pysal_core,ljwolf/pysal,sjsrey/pysal_core,weikang9009/pysal,hasecbinusr/pysal,ljwolf/pysal,pastephens/pysal,TaylorOshan/pysal,pastephens/pysal,lanselin/pysal,jlaura/pysal,ljwolf/pysal_core,pysal/pysal,hasecbinusr/pysal,hasecbinusr/pysal,lixun910/pysal,ljwolf/pysal,sjsrey/pysal_core,jlaura/pysal,sjsrey/pysal_core,lixun910/pysal,TaylorOshan/pysal,pastephens/pysal,lixun910/pysal,sjsrey/pysal,TaylorOshan/pysal,ljwolf/pysal_core,pedrovma/pysal,jlaura/pysal