Correct "different than" to "different from" where appropriate

Correct "different than" to "different from" where appropriate

(doc/emacs/screen.texi)
(doc/lispintro/emacs-lisp-intro.texi)
(doc/misc/calc.texi)
(doc/misc/gnus.texi)
(doc/misc/sc.texi)
(lisp/align.el)
(lisp/allout-widgets.el)
(lisp/allout.el)
(lisp/emacs-lisp/gv.el)
(lisp/font-lock.el)
(lisp/gnus/mm-util.el)
(lisp/mail/feedmail.el)
(lisp/mail/sendmail.el)
(lisp/mail/supercite.el)
(lisp/org/org-attach.el)
(lisp/progmodes/cc-langs.el)
(lisp/progmodes/idlw-shell.el)
(lisp/ps-print.el)
(lisp/simple.el)
(src/cmds.c)
(src/editfns.c)
(src/frame.h)
(src/regex-emacs.c)
(src/xfaces.c): Replace "different than" by "different from".