Patch/pcfill#119

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WPringle wants to merge 3 commits intomainfrom

Commits on Jan 22, 2026

changes to chavas pc_fill to ensure validility of Vmax (min of 20 m/s) and using regression with Vmax (instead of Vmax**2) when R34 is unknown
WPringle
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adding lower bound for Vsrm and filling in any R34 nans for the Courtney and Knaff Pc fill method
WPringle
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adding the pcfill test to compare to Takis's results.
WPringle
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