New Version 0.5.7

reduce cpu load
minor performance improvements
con: use single pool connection
con: ssl: clear session data before reconnect
nvml: handle invalid values


This release contains quite some technical work/optimizations, which results most notably in a lower cpu load - about 40% - 30%. It also contains minor solver performance improvements - most notable on an 1060 - about 0.5%, pretty small - however it's still there. ZM uses now a single connection to the pool, since some pools/routers seemed to have difficulties with multiple connections - this might help people who had regular disconnects. Pools which adjust the difficulty based on the share rate won't be able to distinguish between the GPUs because zm uses a single connections now - so the difficulty and thus the share rate might change.

People who requested failover pool support: I'm planning to support it in the next release, I'm releasing this iteration first to make sure the transition to a single connection works as expected.