add: option to throttle or switch off mining
add: option to throttle or switch off mining

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