PSD output no-longer gimp compatible

[Bruno Postle]

This was reported by Soren H on the ptx list:

> I see in the Hugin FAQ that Gimp is not expected to be
> able to read the PSD output from PTStitcher. I'm
> finding though that it loads up fine with working masks
> for me in 1.3.20 and 2.0pre2 - provided I use libpano
> that I compile myself. If I use the .deb from Bruno's
> site, it will fail with a channel compression error.

The .deb package has the recent PSD-fixes patch applied,
so this means that although the patch improves pshop
compatibility, it does the reverse for the gimp
(possibly this is
a gimp bug).