Acid - final release

Optimized quasicrystal code: full window size render ~17 seconds for 30 frames
http://pastebin.com/fjLQnbkB


           xsum >= 0                   // true or false
          (xsum >= 0) | 0              // 0 or 1
        (((xsum >= 0) | 0) << 1)       // 0 or 2
       ((((xsum >= 0) | 0) << 1) - 1)  // 1 or -1
xsum * ((((xsum >= 0) | 0) << 1) - 1)  // xsum or -xsum

If xsum is non-negative, the expression evaluates to xsum.  If it is negative, it evaluates to -xsum, which would be a positive number.  That's a really ignorant way to do abs(xsum).