Re-license manual to GFDL instead of GPL
* README: Update for license change in the manual. Improve "Getting
Started" example.
* muse.texi: Move to `texi' directory. Change license to the GFDL. See
NEWS for rationale. Remove GPL license section, since it seems to be
unnecessary.
* texi/doclicense.texi: New file containing the text of the GFDL.
* texi/Makefile: New file split from the top-level Makefile that handles
generation and installation of the manual.
git-archimport-id: mwolson@gnu.org--2006/muse--main--1.0--patch-257