Rob's Parametric Modular Object Riser / Stand / Support

I needed some monitor stands to get my screens aligned, but I didn't want to waste lots of filament making big parts and then finding I had mis-measured or had a printer malfunction. I looked at many designs on Thingiverse and my result is clearly similar to [lookitsz' Monitor Stand](https://www.thingiverse.com/thing:2758511), but what I came up with is more like a set of blocks and bridges to link them together.

The STL files are really just examples unless you specifically need a stand lo raise a Samsung SyncMaster S22B300 by 60mm. Instead the intent is to use the OpenSCAD modules and create your own set of linked blocks to make the support you need.

For example :

foot(notches=[1,1,1,1,1,1,1,1]); // create a foot with all eight slots (corners and sides)
foot(notches=[0,0,0,0,1,1,1,1]); // create a foot with slots in all four corners
foot(notches=[1,0,0,0,1,0,0,0]); // create a foot with slots in one corner and one side
foot(notches=[0,0,1,0,0