New option -error_behavior with a first occasion image_loading

libisoburn/trunk/xorriso/xorriso_private.h

@@ -184,6 +184,8 @@ struct XorrisO { /* the global context of xorriso */
  int errfile_mode; /* bit0= marked */
  FILE *errfile_fp;
 
+ int img_read_error_mode; /* 0=best_effort , 1=failure , 2=fatal */
+
  char return_with_text[20];
  int return_with_severity;
  int return_with_value;