Using np.minimum instead of default min

[jmlarson1]

When JAX was loaded, line 329 in pounders.py was causing delta to become a jax-float, which is immutable. This would cause issues later in the algorithm (e.g., dividing X by delta in formquad.py would make X immutable as well).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.17%. Comparing base (fa27876) to head (ee67aaf).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #162   +/-   ##
========================================
  Coverage    92.17%   92.17%           
========================================
  Files           84       84           
  Lines         3143     3144    +1     
========================================
+ Hits          2897     2898    +1     
  Misses         246      246           

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