[cvs-nhc98] patch applied (hat): In hat-explore, write all errors to stderr.

[Malcolm Wallace]

Fri Feb 15 07:39:33 PST 2002  malcolm
  * In hat-explore, write all errors to stderr.
  Fix a bug where the function in an application is a null file pointer
  Fix a pattern-match failure when traversing a comma-separated list.
  Fix an incorrect lack of parentheses when an application goes through a
    projection.

    M ./src/hattools/SExp.hs -14 +19