added question for Eric
gui: added seletion button images
pvcam: clean up + ensure the temp timer never get tripped by closing/opening the lib
gui: added view button images
pvcam: change binning to 2D

also fix ._name mixup preventing to be used as a Component
Merge branch 'master' of vpn.delmic.com:odemis
doc: add info about princeton instruments camera support

also remove mention of pycomedi, which we don't use