New API function iso_init_with_flag().

Moved setup of locale from various places to util.c:iso_init_locale().
It is now called by the iso_init*() functions only.

libisofs/fs_image.c

@@ -2153,10 +2153,12 @@ int iso_image_filesystem_new(IsoDataSource *src, struct iso_read_opts *opts,
     data->aaip_load = !opts->noaaip;
     data->aaip_version = -1;
 
+#ifdef Libisofs_setlocale_in_iniT
     /* ??? ts Nov 25 2008 :
        Shouldn't this go to library initialization or even to app ?
     */
     setlocale(LC_CTYPE, "");
+#endif
 
     data->local_charset = strdup(iso_get_local_charset(0));
     if (data->local_charset == NULL) {