typo in Switch.py
Further work on CamReader.py.
	- Now with correct pointering (info from Imgsrv-page on elphel-Wiki).
	- Less verbose when the directory exists or we don't need it (in the -s case)
	- Tried several ways of speeding up image display, but this doesn't seem to work, still using matplotlib
	- The matplotlib-image has slightly more meaningful title