Make interwiki links work in a few more edge cases.
* lisp/muse-project.el (muse-project-applicable-styles): Remove
assertion, now that I have a good idea of the edge cases involved.
* lisp/muse-wiki.el (muse-wiki-resolve-project-page): Handle case where
the current file is not part of any Muse project, allowing interwiki
links to be resolvable even then. Don't return a relative path if we
are not publishing. For visiting links, the best thing is just to
return the real path.
git-archimport-id: mwolson@gnu.org--2005/muse--main--1.0--patch-179