avalon: Since detection is not really implemented, only probe devices when the driver is specified to -S by name (eg, "avalon:/dev/ttyUSB0")
configure: Enable Avalon support by default now that it behaves reasonably
Bugfix: Cleanly count discarded (stale) shares without overlapping devices/sshare locks within clear_stratum_shares
Count weighed discarded (stale) shares per cgpu
Calculate rejection percentage based on weighed shares, not absolute counts
Merge branch 'weighed_rej_percent' into bfgminer