partial poc6 fixes
partial poc6 fixes

changwu-tw/pyethapp,changwu-tw/pyethapp,RomanZacharia/pyethapp,gsalgado/pyethapp,ethereum/pyethapp,kustomzone/pyethapp,heikoheiko/pyethapp,ethereum/pyethapp,vaporry/pyethapp,danielnovy/test,gsalgado/pyethapp,RomanZacharia/pyethapp,d-das/pyethapp