* primer3: move to github, add 2.5.0, fix 2.3.7
- The Primer3 project moved to GitHub.
- update the URL
- compare the tarballs 2.3.7 from Sourceforge and github, no
significant differences (e.g. the Sourceforge tarball contained a
couple of "tmp" files).
- update the signature for the 2.3.7 tarball.
- @2.3.7 doesn't build with gcc@8.4.0, there's a dubious pointer/int
comparison that causes an error. It was fixed upstream in newer
versions, apply simple patch to this version so that it continues to
be build-able with newer compilers. See:
- https://github.com/primer3-org/primer3/issues/2
- https://github.com/primer3-org/primer3/issues/3
- Add info for @2.5.0, which builds cleanly.
* Flake8 cleanup
1b2638c9b1