add "sort by exif date" feature suggested by JC
[booh] / bin /
drwxr-xr-x   ..
-rwxr-xr-x 181742 booh
-rwxr-xr-x 50569 booh-backend
-rw-r--r-- 974 booh-fix-whitebalance
-rwxr-xr-x 4719 webalbum2booh