feat: Implement pwlinRoots for roots of discrete data

PHASTA / vtkpytools

Internal tools for using VTK

BSD 3-Clause "New" or "Revised" License

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Closed jrwrigh closed 3 years ago

jrwrigh commented 3 years ago

Create ~pieceLinRoots~pwlinRoots function to find the roots of discrete data points using linear interpolation.

Created numtools as a generic numerical function module, separate from common
- common will continue to contain more generic utility functions

Closes #60.