* update GF mode

- moved to new repo at
  https://github.com/GrammaticalFramework/gf-emacs-mode
- main changes:
  - use utf-8 encoding for inferior gf process
  - add display of operation types
- update links

doc/gf-editor-modes.t2t

@@ -13,9 +13,10 @@ welcome!
 
 ==Emacs==
 
-[gf.el ../src/tools/gf.el] by Johan Bockgård provides syntax highlighting and
+[gf.el https://github.com/GrammaticalFramework/gf-emacs-mode] by Johan
-automatic indentation and lets you run the GF Shell in an emacs buffer.
+Bockgård provides syntax highlighting and automatic indentation and
-See installation instructions inside.
+lets you run the GF Shell in an emacs buffer.  See installation
+instructions inside.
 
 ==Atom==
 [language-gf https://atom.io/packages/language-gf], by John J. Camilleri