capture.cpp: use common EXIT codes
capture.cpp: use common EXIT codes

Also changes some printf() to Log(0, xxx).
Remove call to waitToFix() since allsky.sh now stops the servers on EXIT_ERROR_STOP.
Don't display notification image on exit - it's now done in allsky.sh
thomasjacquin/allsky,thomasjacquin/allsky,thomasjacquin/allsky