feature request: better caching

I've been using gqview for a long time, so first thanks for all the
work.

Flipping back and forth between two photos is fast due to caching, and I
think a bit more caching could speed things up a lot.  (I now usually
use gqview on a machine with 2 GB of RAM.)  I don't know how hard this
is, so thought I'd throw out the suggestions:

1) Instead of caching/prefetching 1 file, cache up to some limit,
   perhaps on the order of 10, so that when flipping among 5 to choose
   which to keep it's faster.

2) Perhaps for all files, remember exif orientation, or read orientation
   first before starting display.  Currently, I get the image showing up
   in file orientation, and then flipped to the right orientation.  It
   would be really nice if this were drawn right from the start.

Greg


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