biology/paml: update to version 4.9c and various improvements
- Update to version 4.9c
- Set LICENSE=GPLv3
- Use the variable PORTDOCS to automate the generation of the DOCS plist (as suggested by mat@).
- Install dat/ examples/ and Technical/ directories as well as files in the root directory of the distribution tarball.
- Fix broken permissions.
- Delete Windows executables.
- Build and install useful binaries not built by upstream's Makefile.
- Update pkg-descr.
Reviewed by: swills (mentor)
Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D8040