* A recursive insertion sort
* added doctests and typehints
* Added arc length and numerical integration calculators
* fixed doc test
* Fixed some conversion errors
* Fixed some commenting
* Deleted numerical integration to allow 1 file per push
* Changed string formatting method
* Added program to calculate trapezoidal area under curve
* Deleted files ensure 1 pull request per file
* file name changed
* Update area_under_curve.py
Co-authored-by: Christian Clauss <cclauss@me.com>