Make writing output files go faster, and do not trigger any other modes

Make writing output files go faster, and do not trigger any other modes

* lisp/muse-book.el (muse-book-publish): Use muse-write-file.  Only
  display the success message if the write succeeded.

* lisp/muse-publish.el (muse-publish-file): Use muse-write-file.  Only
  run the :final hooks if the write succeeded.

* lisp/muse.el (muse-with-temp-buffer): Put error message on separate
  line for readability.
  (muse-write-file): New function that writes the current buffer to the
  given file, without trying to visit it, backing it up, or triggering
  vc.el.
git-archimport-id: mwolson@gnu.org--2006/muse--main--1.0--patch-427