Fully revert to old license metadata

PyPI didn't like 'License-File: LICENSE.rst' either.

[ci skip]

Ready for Biopython 1.85 today

Explicitly exclude the Sphinx build dir

Call this Biopython 1.83

Call this Biopython 1.82

Commit Release 1.81 (#4233)

* Disable part of qblast test_short_query.

* Updated list of contributors for 1.81

* Biopython 1.81

* Fix docstrings for Sphinx API docs to succeed

* Add convenience clean methods to Makefiles to simplify building/testing.

Version bump for v1.80

Fix LaTeX syntax to allow documentation to build.

Ready for Biopython 1.78

Update Tutorial with links to 1.77 api docs (#2903)

Changed links from API docs built with epydoc to those built with Sphinx