Merge pull request #480 from kanoi/master

usbutils cps sleep_estimate is not an underestimate
Thread reportin and out can be static non inline.
Only report threads in and out in queued work devices across a get work since the rest happens asynchronously and the get work is what the device might be waiting on.
We don't want to continue into the hash_pop function if the getq is frozen.
Provide a message and set a bool when no work is available from any pools and when it resumes again.
Only display the no pool work message once if there are multiple waiters in hash_pop
Reorder support names alphabetically.
Stratum is used more often so test for it first.
Return positive for cnx_needed when no_work is true.
Check for cnx_needed on each loop through wait_lp_current.
Add avalon HW error% to stats and only show BTB variables if avalon is a BTB.
Use stack data for HW error% in avalon stats.
Update NEWS.
Bump version number to 3.4.0