Function for drawing a simple scale on a blighty map
Integer value for the width of the bar.
No return value
This function draws a simple bar for a scale with the length of the bar in km beneath it.
AUTO (default) draws the scale in the North-East corner of the map.
select prompts for locator to allow the user to place the centre of the scale manually. If you send a vector then the vector gives the position of the centre of the scale.
You can't use this with other high level plotting commands (such as
blighty() stores the mapping parameters from it's last invocation in an object called
blighty.mapinfo from which the position, and size, of the scale is calculated.
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