Bugs/todo from dylan-mode.el comments

[lassik]

Bugs / to-do list

• Don't highlight macro variables (e.g., "?x:" in ?x:name) as keywords.
  Just highlight the "x" as a variable binding.

• Customize fill-column to some acceptable value so that auto-filled
  comments are filled at a standard place > 70. I use 89 myself.

• It appears as though some code matches only some of the graphic-character
  BNF when it should match all graphic chars.