Demote bflsc hw error messages to verbose logging only.
Merge pull request #454 from kanoi/master

bflsc - handle xlink timeouts by having generic IO functions
Make the fan control on the avalon a simple PID controller with a target temperature of 45.
Demote no matching work message to verbose logging only on avalon.
Add an --avalon-temp option to allow a user specified target temperature.
Update NEWS.
Change mode on python file.
Fix build warning.
Bump version to 3.3.0