Grscheller.boring-math

* reflecting grscheller.circular-array PyPI dependency change
* dependencies = ["grscheller.circular-array >= 0.2.0, < 2.1"]

* decided it a good time for a PyPI release
* want to use some of the newer features in new endeavors
* vastly improved documentation over last PyPI release

* greatly simplified README.md
* due to having better control of pdoc documentation
* allowing me to be a bit more DRY
* now more likely to keep README.md up-to-date with detailed docs

* renamed integer_math.mkCoprime to integer_math.coprime
* did it now before PyPI v0.3.0
* realized pdoc uses Markdown as its preferred mrkup language
* some differences
* incorporates some GitHub Markdown additions
* will format google-style & numpydoc style comments
* lists are one dimensional, not higherarchical

* Updated pythag3 cli script to provide more functionality
* docstring and README.md improvements

* All implementations going forward for integer_math module will use
just integer based algorithms. I can't really compete with C based
code from the Python standard library. The algorithms will then be
of use if ported to a platform without floating point arithmetic.
* added two new functions to the integer_math module
* iSqrt() finds the int square root of an int
* does same thing as math.isqrt()
* isSqr() return true if integer argurment is a perfect square
* changed integer_math pythag3() function into a class method
* pythag3() -> Pythag3.triples()
* preliminary steps
* fould unrelated tweak to increase speed by 2X
* removed use of floating point numbers