Infrastructure for glyph-driven aggregate creation.
Fist executable aggregate reducer version (does not work).
Merging UI changes
UI for controlling aggregate-reducer renderer working...rendering is not.
Glyph-parallel rendering mostly works (if you don't pan things off screen)
Glyph-parallel rendering works (but is slow)
Significantly faster parallel-glyphs renderer...still not as fast as parallel-spatial though.
MemMap doesn't crash...but nothing renders.
Modified to use rectangle-as-pixel from point-as-pixel.  Memory mapped glyph-list working.