timelapse.sh: keep quiet unless there's an error
timelapse.sh: keep quiet unless there's an error

No need to check for 0-length files since the saveImage*.sh scripts already did.
Keogram and startrails scripts don't say how many files they are processing, so timelapse shouldn't either.
We don't mention other settings so no need to mention "scale" setting.
Keogram and startrails scripts don't say say files were created, so timelapse shouldn't either.
thomasjacquin/allsky,thomasjacquin/allsky,thomasjacquin/allsky