gui: Additional text/unit formatting fix
model: Continuous Vattributes now support (optional) clipping to their range
gui: Fix for absolute brightness and contrast control
gui: merge conflict fix
install: fix naming udev rule

ensure it doesn't conflict with the original pilk-usb udev rule
gui: Show load message when opening files
gui tab: fix SPARC acquisition tab when no spectrometer is available

Need to make sure that no reference to the spectrometer (stream) is done if the hardware is not present.
gui: Fix for AR intensity ranges
gui: Increased view selector/thumbnails size
driver semcomedi: avoid running the garbage collector too often

on small acquisitions, it could be very costly, so maximum every 2 s.
config: fix parking voltage for FEI XL 30

Too high voltages were causing ebeam shift
Merge branch 'master' of vpn.delmic.com:odemis