Added expection handling when there are no variants

Fixed Typo in hierarchical clustering function

Added comments

Updated Description

Fixed a duplication issue

Fixed typo

Fixed Output filenames

Update Analysis_functions.py

Fixed co-occurence plot

Fixes to Read and requirements; removed print statements

Update OPTIC_config.txt

Update README.md

Update Analysis_functions.py

Changed the mutation matrix to be 'oncoprint' style

Initial Commit