Mobile Shop : require 2 times entry of location in the purchasing pipeline

_mobileshop
_location

Then the app is compiled with REGISTRATION_REQUIRED=FALSE during the checkout process the address is required. Additionally feature #39 asks for the availability of correcting the location pin after entering the address.

This feature requires additionally to enable another point to input the location. When the app starts in delivery mode (the default mode if set) a location in the map should be prompted, in order to show products only within the delivery distance.

During the checkout process the location on the map should be asked again (as in feature #39) for similar but not exactly the same purposes, which is handing in the food.