Provide a variant of find_work_bymidstate that returns a clone of the found work.
Use cloned work when finding avalon results since another thread can discard the work item while it's in use.
avalon for timeout allow d='calculate it' and fix uninitialised
BTB allow up to 1400mV as per firmware limits
Add c to ambient temperature display for avalon driver.
Merge pull request #476 from kanoi/master

avalon for timeout allow d='calculate it' and fix uninitialised
Do not poll in avalon_get_results without sleeping if we have finished parsing a full result.
Merge branch 'master' of github.com:ckolivas/cgminer