Kind sig for toplevel family decls is optional

Mon Sep 18 19:13:47 EDT 2006  Manuel M T Chakravarty <chak@cse.unsw.edu.au>
  * Kind sig for toplevel family decls is optional
  Sat Aug 26 19:03:50 EDT 2006  Manuel M T Chakravarty <chak@cse.unsw.edu.au>
    * Kind sig for toplevel family decls is optional
    - Kind sigs are still compulsory for AT family decls.  Changing this is more
      tricky, as AT decls don't have the family keyword and hence look like empty
      data decls.  That impacts reduce/reduce conflicts and/or the criteria for
      checking whether a TyData variant is a family signature.
    - Also removed iso from the syntax (it's still in the lexer in case we want to
      resurrect it).