patch applied (ghc): Make sym coercion smart constructor smarter, add comments

[chak at cse.unsw.edu.au]

Wed Sep 20 11:14:48 PDT 2006  Manuel M T Chakravarty <chak at cse.unsw.edu.au>
  * Make sym coercion smart constructor smarter, add comments
  Mon Sep 18 17:11:59 EDT 2006  Manuel M T Chakravarty <chak at cse.unsw.edu.au>
    * Make sym coercion smart constructor smarter, add comments
    Sun Aug  6 20:32:58 EDT 2006  Manuel M T Chakravarty <chak at cse.unsw.edu.au>
      * Make sym coercion smart constructor smarter, add comments
      Tue Aug  1 11:30:14 EDT 2006  kevind at bu.edu

    M ./compiler/typecheck/TcGadt.lhs -2 +4
    M ./compiler/types/Coercion.lhs -5 +27