Add double/float pixel graphics option

[paulrho]

with anti-alias switched on, this could allow for smoother dot-by-dot plotting
switch on with ANTIALIAS 2 (sets extra render hints too)
and also calls to LINE, PSET, CIRCLE will then also flip to using draw(Shape .. double)
also (maybe) allow draw to have ANY number of points after it !?!?
Also, think about how to measure performance impact.

[paulrho]

consider these:

• https://stackoverflow.com/questions/12415640/is-there-any-way-to-draw-lines-with-subpixel-precision-in-swing?noredirect=1&lq=1
• https://stackoverflow.com/questions/5018635/java-does-subpixel-line-accuracy-require-an-affinetransform

[paulrho]

Activated by ANTIALIAS 2
Check if all painting/drawing primitive functions have been extended to allow this.