cuda: revert to SM 5.0 only by default
stratum: prevent a booo when receiving a new block

seems to works in solo mode too...

note: anime wallet to check, different problem without reject-reason
intensity: sign warnings fixes min(i,u)
x11: restore default intensity to 19 on windows
hashlog: use work objects, put struct in miner.h
api: add meminfo query to debug mem storages