get_figure_region

Hand-select points in a figure and return the x and y values, while plotting points selected.

This is a simple extension of the ginput tool that allows the user to hand-select points on a figure. The differences between this and the normal ginput tool are as follows:
a) The selected points are plotted as a line while the selection is being made, so it is easy to see what points have been chosen (this plot is removed after the selection is complete).
b) Pressing ESC or 'x' cancels the selection.
c) The tool can be told which axes to work with.