Recent changes to 26: generate error file *.err like mpasm

Recent changes to 26: generate error file *.err like mpasmhttp://sourceforge.net/p/gputils/feature-requests/26/2012-08-12T11:40:52Z2012-08-12T11:40:52Z2012-08-12T11:40:52ZBorut Ražemhttp://sourceforge.net/u/borutr/http://sourceforge.netb49d95d3fe6326660cbd2f22d0970bb9c620b58c