Extension to vtkParallelCoordinatesActor:
newly added methods:

1) SetNthSRange(int idx, int N, double Smin, double Smax)
	used for selecting a portion of data on a particular axes. The idx is the axes number and the Smin and Smax are the range of data values which have to be highlighted in the parallelcoordinates actor.

2) SetNthAxesOrder(int idx, int N, int order)
	used for reordering the axes. for example assuming a four dimensional plot and if the user wants to reorder the axes to (2,3,1,4) he would use the function in this way.
	SetNthAxesOrder(1,4,2);
	SetNthAxesOrder(2,4,3);
	SetNthAxesOrder(3,4,1);
	SetNthAxesOrder(4,4,4);

3) The above method can be used to delete the axes. for example if the user only wants to view the 2nd and the 4th axes
	SetNthAxesOrder(1,4,2);
	SetNthAxesOrder(2,4,4);
	SetNthAxesOrder(3,4,-1);
	SetNthAxesOrder(4,4,-1);
	-1 would mean to delete the axes.
