Fixed reprocess_frame to work correctly for multiple tries because it now reads the roi.in file instead making a new one.
Modified create_roi_in so that if no vector file is found on the requested day, the TLEs are used instead.
Modified roi2img to use TLEs if no vectors files are found.
reprocess_frame now defaults to using stVecs and clock drift.
can use -t switch to switch back to using TLEs.
Merge branch 'master' of github.com:talogan/ASF_MapReady into seasat
Always generate the swath metadata, do not reuse.