Use area() with GeoPoint, not GeoTrace nor GeoShape

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It looks like the documentation is incomplete! I've filed an issue to update that.

You have two options for computing area without a geoshape:

  1. Concatenate several points together with semicolons in between. In XLSForm, that would look like introducing a calculate with calculation contact(${point1}, ';', ${point2}...} and then calling area on that.
  2. Use points in a repeat. In XLSForm, that would look like calling area(${my-point-in-repeat}) outside of the repeat.
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