tiff: fix IFD incorrect with RGB images

Correctly detect RGB images, which are saved into just one IFD, instead of 3 separate IFDs (one per channel)
gui: Added spectormeter acquisition roi grid
Merge branch 'master' of delmic-server.local:odemis
Merge branch 'master' of vpn.delmic.com:odemis
add some logging to test cases and fix string encoding in TIFF

also remove explicit logging.shutdown in cli, as it's actually always handled by "atexit".
tiff: fix pixel type name for float /complex