[cvs-nhc98] patch applied (hat): Hat-Lib: ensure that ghc can catch all kinds of error like nhc98.

[Malcolm Wallace]

Fri Jul  5 08:03:56 PDT 2002  olaf
  * Hat-Lib: ensure that ghc can catch all kinds of error like nhc98.
  
  Use ghc's Exception.catch and some hooks in the runtime system.
  In particular, backholes and out of memory errors are now handled.

    M ./src/hatlib/Hat.hs -1 +18
    M ./src/hatlib/hat-c.c -1 +17
    M ./src/hatlib/hat-c.h +1