Clear selection from the list

[dfoll]

In Coordinate Conversion you cannot clear the selected points.

Repro steps:

1. Add some points to the Coordinate Conversion List either by importing some points or using the Map Point tool to click on the map.
2. Click a point in the List point highlights in the list and in the map

At this point you cannot get the List or the points in the map back to a state where no point is selected.

Selection should behave like feature selection, when you click in a black space in the map the current selection is removed.