[cvs-nhc98] patch applied (hat): When printing source positions, avoid inelegant output like

Mon Aug 2 05:20:20 PDT 2004 malcolm * When printing source positions, avoid inelegant output like 23:12-23:12 and 23:12-0:0 by collapsing both to just 23:12 M ./src/compiler98/Extra.hs -2 +4