Send only latest points since auto-send

[lianergoist]

The auto-send for Custom URL sends the entire CVS file every time, and not just the points since last auto-send. That may be smart in some situations, but in other, we only want the latest points. It would be nice to be able to choose what to get.

The Discard offline location is not really an option, because it does not ques the points when offline. It would be really cool if Custom URL only sends the latest point(s) since last auto-update, but if the phone goes off-line, it will send all points since it was last online.