Ern - 2011-02-18

I cannot find anther image with the APP13 marker located before the exif marker. So, this is how is solved ( in exif-data.c):

Added APP13 definition:
#undef JPEG_MARKER_APP13
#define JPEG_MARKER_APP13 0xed

and in exif_data_load_data change:
/* JPEG_MARKER_APP0 */
if (d[0] == JPEG_MARKER_APP0 ) {

to:
/* JPEG_MARKER_APP0 */
if (d[0] == JPEG_MARKER_APP0 ||
d[0]==JPEG_MARKER_APP13) {

After that, Photoshop segment is bypassed, and EXIF info is correctly read.
I think maybe that should be done for all known EXIF app segments, just in case any of them gets located before the EXIF segment.