use jpegtran to do lossless 90 rotations

utils/pa_rotate

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+echo "start"
+b=`basename $1`
+echo "b=$b"
+mv $1 /tmp/$b
+echo "mv $1 to /tmp/$b"
+jpegtran -outfile $1 -rotate $2 /tmp/$b
+echo "done jpegtran"