Don't prompt unnecessarily when doing C-c C-t in a Muse project file.
* lisp/muse-publish.el (muse-publish-get-output-dir): Use
`muse-read-directory-name' instead of `read-file-name'. Now Muse won't
offer the style and directory prompt when you hit C-c C-t in a file
belonging to a defined Muse project. Otherwise prompt. Thanks to Yann
Hodique for the fix.
* lisp/muse.el (muse-read-directory-name): New function that defines a
fallback version of `read-directory-name', since Emacs21 doesn't have
it.
git-archimport-id: mwolson@gnu.org--2005/muse--main--1.0--patch-209