gui: Added alignment tips to the alignment tab
gui: Added a small histogram widget
Merge branch 'master' of delmic-server.local:odemis
driver andorcam2: add possibility to change the fake image returned by the simulator

will allow to test the find_overlay functions
acq find_overlay: new fake image to run test cases

also add a new simulated configuration that put the hardware in the right settings.
now the test cases passes
Merge branch 'master' of vpn.delmic.com:odemis
gui histogram: fix display problem

division from future is important!
gui: small clean ups

remove debug code, and some non used code/comments