Added a warning message if the file is not found.

simgear/constants.h

@@ -123,7 +123,7 @@
 
 /** Highest binobj format version we know how to read/write.  This starts at
  *  0 and can go up to 65535 */
-#define SG_BINOBJ_VERSION 5
+#define SG_BINOBJ_VERSION 6
 
 /** for backwards compatibility */
 #define SG_SCENERY_FILE_FORMAT "0.4"

simgear/io/sg_binobj.cxx

@@ -320,8 +320,8 @@ bool SGBinObject::read_bin( const string& file ) {
     if ( (fp = gzopen( file.c_str(), "rb" )) == NULL ) {
 	string filegz = file + ".gz";
 	if ( (fp = gzopen( filegz.c_str(), "rb" )) == NULL ) {
-	    // cout << "ERROR: opening " << file << " or " << filegz
-	    //      << "for reading!" << endl;
+	    cout << "ERROR: opening " << file << " or " << filegz
+	         << "for reading!" << endl;
 
 	    return false;
 	}