Added display of adjustments needed

[AndyQ]

This change displays the relative offset of each point from the center, and the specific adjustments required to each point.

Its based on code from https://github.com/pcboy/g81_relative

Output on graph looks like:

Relative offset             Adjustment Degrees                Adjustment Fractional Turns
-0.07    -0.02    -0.01     50deg CCW  14deg CCW  7deg CCW    0.1 CCW    0 CCW   0 CCW
-0.08     0        0.05     58deg CCW  0          36deg CW    0.2 CCW    0       0.1 CW
-0.09     0.02     0.02     65deg CCW  14deg CW   14deg CW    0.2 CCW    0 CCW   0 CCW