Automatic scheme-mode setting

Emacs mode can be chosen automatically on the file's name. To edit file ended by .stk or .stklos in Scheme mode, you have to set the Elisp variable auto-mode-alist to control the correspondence between those suffixes and the scheme mode. The simpler way to set this variable consists to add the following lines in your .emacs startup file.

;; Add the '.stk' and '.stklos' suffix in the auto-mode-alist Emacs
;; variable. Setting this variable permits to automagically place the
;; buffer in scheme-mode.
(setq-default auto-mode-alist (append auto-mode-alist 
                                      ("\\.stk$"    . scheme-mode)
                                      ("\\.stklos$" . scheme-mode)))