Check for Surface Pinchouts

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This action will check the volume for negative volumes that are created by intersecting surfaces. Negative volumes are created when a surface crosses through and above another surface that is higher in the volume surfaces list. Negative volumes are not supported and should be fixed using the available surface intersection tools. Finite element solvers will not operate with negative volumes present. The SVSlope solver is more tolerant of negative volumes, but there are still a variety of potential issues that can be caused by them. For example, the critical slip surface may not be found due to the corresponding trial slip surface not being generated, and the model may not display correctly (e.g., elevation contouring will appear incomplete if the top surface is not actually at the top in some areas).