Saves image as JPG

Current versions of Windows support Jpg. Now we check if that's allowed
& save as Jpg instead of Bmp because Jpg files are smaller.

Originally, I was trying to fix a problem that seemed to happen a
bunch--During save, an exception would be thrown ("A generic error
occurred in GDI+").
I tried many things discussed in forums, but didn't find anything which
stopped that intermittent error.
Interestingly, I haven't gotten it since I switched to saving Jpg's
instead...

Code maintenance too.