(svn r8838) -Feature: Show newgrf error messages loaded in Action B in the newgrf gui

window. GRFs with an error have a warning symbol shown before the name.

src/newgrf_config.h

@@ -24,6 +24,7 @@ typedef struct GRFConfig : public GRFIdentifier {
 	char *filename;
 	char *name;
 	char *info;
+	char *error;
 
 	uint8 flags;
 	uint32 param[0x80];