Add get_breaks function which returns the breaks for the function vario
Update vario() function so that it calls the get_breaks() function
Add annotation to get_breaks() and minor reordering of code
Add function check_vario_direction_args() and incorperate this into the function vario(). These changes are making the core function vario() more concise and readable
Add .gitignore file for this project
Add mete_sor_transform() function which transforms the mete sorensen index prediction for given separation orders to a lower triangular matrix in which each pairwise sample comparison has a mete sorensen prediction based on the samples' separation order.