gui: load example sparc as a spectrum stream
gui: changed mode to 775 for all gui images
gui: Optimized png images using the 'pngcrush' tool, using the command
`pngcrush -brute -rem alla -d tmp *`, which 'brute force' optimzes all
images and strips all the meta data before copying them to the tmp dir.
gui: fixed (stupid) image background color bug
andorcam2: add simulated camera

should help testing... I need a camera with binning
andorcam2: fake camera returns more sensible data

with the right slicing, it's possible to simulate ROI and binning easily
andorcam2: fix readout rate reported by fake camera
gui: Added MicroscopeViewport subclasses to odemis and XRC
andorcam*: change binning to 2D

tests cases seems to pass, at least with fake cameras
spectrometer: fix updating the binning down with large resolution that might cause overflow
Merge branch 'master' of vpn.delmic.com:odemis