Returns a cross section beam fibre position from a specified section of this beam
| fibreName | string | Identifies the fibre | 
| localCoordz | double | The returned local z coordinate of the fibre | 
| localCoordy | double | The returned local y coordinate of the fibre | 
| section | optional integer | section for which the fibre is set (default is 0) | 
| Return value | none | 
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