Added scale transformations in Grapher

This has been on our todo list for a long long time. Grapher now support scales along the X- and Y- axis.

The following example uses a square root transformation on the X-axis and a log transformation on the Y-Axis:

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

g := RTGrapher new.
g extent: 300 @ 300.


ds := RTData new.
ds noDot.
ds points: (0 to: 1000).
ds y: #yourself.
ds x: #yourself.
ds xSqrt.
ds yLog.
ds connectColor: Color red.
g add: ds.

g addDecorator: RTCursorFollower new.
g axisY numberOfTicks: 10.
g
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Cheers,

Alexandre