Rationalise diffs stored in the work struct and document them to avoid further confusion
minion - item is undefined
minion - report temp/cores/freq and handle temp formatting
minion - define frequency value table
minion - disable iostats by default since it slows down mining
minion - allow setting the frequency
api - howoldsec is only used for USB
minion - report init_freq in stats
Merge pull request #588 from kanoi/min

Minion Updates
minion - roll work to reduce CPU
Merge pull request #589 from kanoi/master

minion - roll work to reduce CPU
minion - comment out HW debug message
Merge pull request #590 from kanoi/master

minion - comment out HW debug message
Prevent a segfault when writing a config file containing 'rotate' option
Work stats should be based on device_diff not work_difficulty since non-shares haven't been filtered out yet
Merge pull request #591 from dmaxl/master-upstream

Prevent a segfault when writing a config file containing 'rotate' option
minion - check rolled in stale work cleanup
minion - command queue is now larger
minion - remove unused ioctl debug
minion - all freq in Mhz but only convert when used