* added runge kutta gills method
* added adams-bashforth method of order 2, 3, 4, 5
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* Update adams_bashforth.py
* Deleted extraneous file, maths/numerical_analysis/runge_kutta_gills.py
* Added doctests to each function adams_bashforth.py
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* Update adams_bashforth.py
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>
