* lisp/language/misc-lang.el ("Mende Kikakui"): New language environment.
Add sample text and input method.
* lisp/international/fontset.el (script-representative-chars)
(setup-default-fontset): Support Mende Kikakui, Indic Siyaq Numbers,
Ottoman Siyaq Numbers.
* lisp/leim/quail/misc-lang.el ("mende-kikakui"): New input method.
* etc/HELLO: Add Mende Kikakui greeting.
* etc/NEWS: Announce the new language environment.