gnu: Use HTTPS URLs for GitHub home-pages.

* gnu/packages/bioinformatics.scm, gnu/packages/emacs.scm,
gnu/packages/haskell.scm, gnu/packages/libffi.scm, gnu/packages/lisp.scm,
gnu/packages/ocaml.scm, gnu/packages/openstack.scm, gnu/packages/python.scm,
gnu/packages/ruby.scm, gnu/packages/shells.scm, gnu/packages/statistics.scm,
gnu/packages/xdisorg.scm: Use HTTPS URLs for all packages with a home-page on
GitHub.

Merge branch 'master' into core-updates

gnu: ocaml-qtest: Update to 2.5.

* gnu/packages/ocaml.scm (ocaml-qtest): Update to 2.5.

gnu: Add ocaml-csv.

* gnu/packages/ocaml.scm (ocaml-csv): New variable.

gnu: Add ocaml-sqlite3.

* gnu/packages/ocaml.scm (ocaml-sqlite3): New variable.

Merge branch 'master' into core-updates

gnu: Add ocaml-ppx-typerep-conv.

* gnu/packages/ocaml.scm (ocaml-ppx-typerep-conv): New variable.

gnu: Add ocaml-ppx-let.

* gnu/packages/ocaml.scm (ocaml-ppx-let): New variable.

gnu: Add ocaml-ppx-enumerate.

* gnu/packages/ocaml.scm (ocaml-ppx-enumerate): New variable.

gnu: Add ocaml-ppx-assert.

* gnu/packages/ocaml.scm (ocaml-ppx-assert): New variable.

gnu: Add ocaml-ppx-here.

* gnu/packages/ocaml.scm (ocaml-ppx-here): New variable.

gnu: Add ocaml-ppx-variants-conv.

* gnu/packages/ocaml.scm (ocaml-ppx-variants-conv): New variable.

gnu: Add ocaml-ppx-sexp-conv.

* gnu/packages/ocaml.scm (ocaml-ppx-sexp-conv): New variable.

gnu: Add ocaml-variantslib.

* gnu/packages/ocaml.scm (ocaml-variantslib): New variable.

gnu: Add ocaml-typerep.

* gnu/packages/ocaml.scm (ocaml-typerep): New variable.

gnu: Add ocaml-sexplib.

* gnu/packages/ocaml.scm (ocaml-sexplib): New variable.

Merge branch 'master' into python-tests

Merge remote-tracking branch 'origin/master' into core-updates

gnu: Add ocaml-ppx-compare.

* gnu/packages/ocaml.scm (ocaml-ppx-compare): New variable.

gnu: Add ocaml-ppx-bench.

* gnu/packages/ocaml.scm (ocaml-ppx-bench): New variable.