* guix/swh.scm (%swh-base-url): Turn into a parameter and export it. * tests/swh.scm: New file. * Makefile.am (SCM_TESTS): Add it.
* guix/swh.scm: Export bindings related to 'save-origin'.
* guix/swh.scm: New file. * Makefile.am (MODULES): Add it.