Throughout, make these changes
Copyright headers: GNU Mes
First mention of name: GNU Mes
Website: https://www.gnu.org/software/mes
Git: git://git.savannah.gnu.org/mes.git
Next to the convenient environment setup and package build from git
guix environment -l .guix.scm
guix build -f .guix.scm
we can now also build other included packages
GUIX_PACKAGE_PATH=guix guix build mes@0.17
GUIX_PACKAGE_PATH=guix guix build nyacc@0.80.42
* guix/git/mes.scm: Move from .guix.scm, make a module.
* .guix.scm: Move from guix.scm, use it.
* build-aux/manifest.scm: Update location.
* build-aux/pre-inst-env.in: Support it.
* configure: Check for guix.
* build-aux/export.make: Export GUIX.
* GNUmakefile (update-hash): New target.
Make build system more in alignment with how autotools work. This
will make transition easier.
* mes/module/mes/boot-0.scm.in: Update from module/mes/boot-0.scm.
* scripts/mescc.in: Update from scripts/mescc.
* build-aux/pre-inst-env.in: New file.
* build-aux/cc-mes.sh: Use pre-inst-env.
* configure: Substitute new .in files.
* install.sh: Do not substitute mescc, boot-0.scm.
