New ATF mode files for Emacs

I have updated the ATF mode files for Emacs to work with the new build servers.

In addition to this, I have added an upgraded dead-key mode written by Niek Veldhuis.

Instructions for how to use this are in the file oracc-init.el but here they are for convenience:

;; If your project is on build-oracc use the first oracc-build definition,
;; otherwise use the second.  Use a semi-colon at the start of the line to
;; comment out the definition you don't need.

(setq oracc-build "build-oracc.museum.upenn.edu")
; (setq oracc-build "oracc.ub.uni-muenchen.de")

;; If you prefer to use the slash (virgule, /) as the dead key for the Oracc
;; Emacs keyboard, use the first definition.  Otherwise use the second to make comma
;; your prefix key--this is more user-friendly if you are using a German keyboard. 
;; Use a semi-colon at the start of the line to comment out the definition you
;; don't need.

(setq oracc-prefix "slash")
; (setq oracc-prefix "comma")

Please note that Niek's former documentation about selecting atf-mode_de.el no longer applies as I have replaced this with the oracc-prefix variable.

For information on getting and installing (in case it has been a long time) see:

 http://oracc.museum.upenn.edu/doc/help/usingemacs/emacssetup/index.html