Existing sidecar files cause crash

[Dougie Nisbet <dougie highmoor co uk>]

With some cameras (like my Nikon Coolpix S600) the exif data seems to be 
FUBAR. (Although gthumb can rotate jpegs where f-spot refuses to).

I have f-spot configured to write tags to the file itself. When f-spot 
can't do this, for whatever reason, it attempts to create a sidecar file 
(I wish it wouldn't).

If files are imported into f-spot and a corresponding .xmp file exists 
for that file, f-spot crashes. (an XMP file may exist because of 
previous import followed by export followed by Delete Files from Drive. 
- come to think of it, it's probably Delete Files From Drive that's not 
deleting sidecar files.)

sorry for scrappy hasty report. I've noticed this a few times. Will log 
a decent bug report when I have time.

Dougie