v2.0

BioSNICAR v2 is a major upgrade from BioSNICAR v1. The most significant changes are:

1. implementation of the adding-doubling solver in addition to the Toon solver
2. incorporation of empirically measured glacier and snow algae optical properties
3. complete refactor of the code to conform to object-oriented programming norms
4. branching off of legacy "functional" style BioSNICAR to "classic" branch
5. Comprehensive Sphinx docs hosted at a public URL
6. Extensive automated tests in the form of a pytest suite
7. Github workflow that runs pytest tests for all PRs to main branch