JSp2Cart:

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   Computes the Jacobian for converting from spherical to 
   cartesian coordinates. Spherical coordinates are defined as
   [r,theta,phi] where phi is the angle from the +z axis and theta
   is the angle from +x in the xy-plane.

   x = r*cos(theta)*sin(phi)
   y = r*sin(theta)*sin(phi)
   z = r*cos(phi)

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   Form:
   jC = JSp2Cart( s )
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   ------
   Inputs
   ------
   s	            (3,1)  Spherical coordinates [r,theta,phi]

   -------
   Outputs
   -------
   jC            (3,3)  Jacobian from spherical to cartesian
                          [ ¸x/¸r ¸x/¸theta ¸x/¸phi ]
                          [ ¸y/¸r ¸y/¸theta ¸y/¸phi ]
                          [ ¸z/¸r ¸z/¸theta ¸z/¸phi ]

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