Updated error message format for consistency.

Author: seidewitz

org.modeldriven.alf.eclipse/lib/alf-base.jar

@@ -41,8 +41,8 @@ public int getColumn() {
   }
 
   private String errorMessage(String message) {
-    return "Error at line " + this.getLine() + ", column " +
-           this.getColumn() + ". \u005cn" + message;
+    return "[" + this.getLine() + ":" + this.getColumn() + "] " +
+           message;
   }
 
 /***************

org.modeldriven.alf/dist/alf-base.jar

@@ -67,8 +67,8 @@ public class Parser {
   }
 
   private String errorMessage(String message) {
-    return "Error at line " + this.getLine() + ", column " + 
-           this.getColumn() + ". \n" + message;
+    return "[" + this.getLine() + ":" + this.getColumn() + "] " +
+           message;
   } 
 
 }