scalebar dual english/metric styling

[woodbri@…]

It would be nice to have a scalebar option to generate dual english/metric scalebar where the primary units would be on top and the secondary units would be on the bottom. I'll try character graphics below:

0       1       2   miles
+-----+-+---+---+-+
0     1     2     3 km

This might be limited to only one style of scalebar if that is all that works.

[jnovak@…]

Add four new scalebar styles; 2 is labels above bar filled, 3 is labels above
bar with ticks, 4 is dual scalebars filled, 5 is dual scalebars with ticks.

For the dual scalebar styles, the units set for the scalbar are drawn on the top
bar, and the corresponding units in the other system are used below.  So, if
miles is specified for the scalebar, kilometers is drawn below as illustrated by
the attachments.

[jnovak@…]

Dual scalebars in tick style

[jnovak@…]

Dual scalebars in filled style

[sdlime]

I wonder if we really need new styles or an option to move labels (and tics)
above the main bar. That way you could stack the scalebars as seperate images. 
Could use the label POSTION UC/LC.

Steve