* doc/org/install.org: New file.
* doc/Makefile.am: Add it.
* doc/org/index.org: Link to it.
* doc/org/setup.org: Add macro for
various version numbers.
* doc/org/tools.org: Update version number.
* NEWS, README, bench/ltl2tgba/README, debian/control,
debian/copyright: Update URLs to website.