Better font-locking in emacs-wiki

If you’re having problems with emacs-wiki not highlighting the first
time you view a buffer, you’re probably set to use jit-lock or
lazy-lock. Don’t. Use (setq font-lock-support-mode nil) instead, so
full font-locking will always be performed. You may want to use the
list so that this is only done for planner-mode and emacs-wiki-mode. =)