Backcalculate integral sum into feasible range #116

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drf5n wants to merge 4 commits intobr3ttb:masterfrom

drf5n:backcalculation

Commits on Nov 22, 2021

Backcalculate per Astrom 1989 and http://brettbeauregard.com/blog/2011/04/improving-the-beginner%e2%80%99s-pid-reset-windup/#comment-18721
David Forrest
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Commits on Feb 22, 2023

Update README.txt to .md and add Astrom reference
David Forrest
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Commits on Mar 13, 2023

Expose integral to enable user-space hacking
David Forrest
committed
Add example/PID_heater_simulation
David R Forrest
committed