Also update dependencies to build latest py-deeptools versions and
add a patch to run tests:
* Replace pypi URL with github URL to download tests
* Update dependency versions of py-pysam, py-matplotlib
* Add new py-deeptoolsintervals package as a dependency
* Add py-plotly and py-nose dependencies
* Patch setup.py to collect and run tests
- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only