Cleanup for etc/refcards/Makefile and related items
* .bzrignore: Unignore etc/refcards/Makefile. * make-dist: Do not distribute etc/refcards TeX intermediate files. * Makefile.in (install-arch-indep): Do not install etc/refcards TeX intermediate files. * etc/refcards/Makefile: Rewrite to use portable Makefile syntax. Add language-specific targets. (distclean, extraclean): New rules. * etc/refcards/README: Add copyright and license. Add Makefile details. Mention http and FSF store versions.
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