WCS keyword issues in ota_sourcefind

Line 37 in ota_sourcefind.py had been changed to the following to help with and issue with the 5x6 data.

`w.wcs.ctype = ["RA---TPV", "DEC--TPV"]`

It looks like this does not work for podi. All of the stars were returned with identical Ra and Dec values. I will try adding an if statement to only set the keywords to the TPV values if it is odi 5x6 data.
