Fixed knot link coloring scheme.

Included the 18 possibilties for the different parity combinations of
the three tangles Of, Ob and k.
Improved comments for EquationGraph.java.
Scaled the size of the tangles and their numerators
Changed font size and background colors of DisplayPanel.java.

Tangle equations have font size 18 and is not more readable.
Scalled the four plat graphs.