gui: Added explicit height of 40 pixels to legends
gui: first version of plot viewport
gui: Added plot tick and axis value rendering
Merge branch 'plotcanvas'
gui: Added alignment Y direction step size slider
gui: disable value cache in plot canvas, because of bug
driver pigcs: add some more debug messages

also start a simulator for the controller, to allow debugging without the hardware
image: minor changes
add debug messages related to stage movement

needed to find about a bug preventing the stage not to move when dragging the image
Merge branch 'master' of vpn.delmic.com:odemis