Extend geometry getter functions of Face and Cell class

Marcus Mohrrequested to merge
mohr/face+cell-geometry-methods into master

This MR adds three new functions:

  • Face::getIncircleRadius()
  • Cell::getVolume()
  • Cell::getInsphereRadius()

We test these together with the existing Face::getArea() function in the new Face+CellGeometryTest.

Edited by Marcus Mohr

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