Make it possible to remove the spine from RSChart

[olekscode]

Example:

x := -10.0 to: 20.0 count: 100.

chart := RSChart new
    add: (RSScatterPlot new x: x y: (x raisedTo: 3));
    add: (RSLinePlot new x: x y: (x raisedTo: 2));
    removeAxisLines;
    yourself.

Expected result (something like this):

x := -10.0 to: 20.0 count: 100.

chart := RSChart new
    add: (RSScatterPlot new x: x y: (x raisedTo: 3));
    add: (RSLinePlot new x: x y: (x raisedTo: 2));
    removeTopAxisLine;
    removeRightAxisLine;
    yourself.

Expected result:

x := -10.0 to: 20.0 count: 100.

chart := RSChart new
    add: (RSScatterPlot new x: x y: (x raisedTo: 3));
    add: (RSLinePlot new x: x y: (x raisedTo: 2));
    removeTopAxisLine;
    removeLeftAxisLine;
    yourself.

[akevalion]

moved to pharo-graphics/Roassal