[cvs-nhc98] Display AtomAbstract values e.g. IO as {IO} instead of _IO

malcolm: Fri Jun 14 12:33:54 CEST 2002 Update of /usr/src/master/nhc/src/hat/tools In directory hinken:/tmp/cvs-serv17383 Modified Files: SExp.hs artutils.c Log Message: Display AtomAbstract values e.g. IO as {IO} instead of _IO_. Also, fix a display problem with cyclic lists where the terminating ] was missing.