Compute the flux in the far fields using a Trapezoidal rule rather than a Riemann sum

[oskooi]

Modifies the calculation of the total flux of the far fields using the Trapezoial Rule (via numpy.trapezoid) rather than the existing finite summation (numpy.sum) for the tutorial examples in Near to Far Field Spectra. This change is intended to simplify the calculation and slightly improve its accuracy.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.89%. Comparing base (f29a8c7) to head (04d6777).
⚠️ Report is 96 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3126      +/-   ##
==========================================
+ Coverage   73.81%   73.89%   +0.08%     
==========================================
  Files          18       18              
  Lines        5423     5452      +29     
==========================================
+ Hits         4003     4029      +26     
- Misses       1420     1423       +3     

see 2 files with indirect coverage changes

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