* guix/scripts/style.scm, tests/style.scm: New files. * Makefile.am (MODULES, SCM_TESTS): Add them. * po/guix/POTFILES.in: Add 'guix/scripts/style.scm'. * doc/guix.texi (Invoking guix style): New node. (package Reference): Reference it. (Invoking guix lint): Likewise.