### Closes #133

Property Surface.Rc now behaves similarly to the geometric Cavity properties in that it always returns a two-element NumPy array for the RoCs in the x, y planes. Removed some obsolete tests due to this change.

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Property Surface.Rc now behaves similarly to the geometric Cavity properties in that it always returns a two-element NumPy array for the RoCs in the x, y planes. Removed some obsolete tests due to this change.

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with
**12 additions**
and
**37 deletions**
**+12**
**-37**