Fix failure to resolve interwiki link when clicking on it.
* Makefile (debclean): Minor tweak.
* lisp/muse-mode.el (muse-visit-link-default): Indentation fix. No func
change.
* lisp/muse-project.el (muse-project-find-file): Don't add file
extensions to a relative name. If we're dealing with a file, open it
up without searching through the various projects for a path. This
should fix the failure to resolve an interwiki link by clicking on it.
git-archimport-id: mwolson@gnu.org--2005/muse--main--1.0--patch-192