gui: Fixed division by zero bug in Slider and refactored code
Merge branch 'master' of 192.168.92.5:odemis
driver andorshrk: workaround communication error

communication error seem to happen only once, and then it works again, so just try multiple times.

also put all the tests. Everything passes so far...
Merge branch 'master' of vpn.delmic.com:odemis