cmaps

[WardDeb]

Initially these changes are to deal with the matplotlib - deeptools mismatch when deeptools < 3.5.3 and mpl >= 3.8, but some additional things came up. In brief:

• float calls on series will be deprecated and need iloc
• yaml load is deprecated, switched to safe_load
• loosened the version requirements, but updated those for deeptools & python
• installation instructions updated to use pip instead of setup.py (works without any change for now it seems)
• implemented a minimal runner that runs the tests in the repo, changed the relative paths to be the repo root to accomodate the runner