Bugs and todo items:

* pfsinraw and pfsoutraw command for camera's raw formats
* pfsinhdrjpeg and pfsouthdrjpeg for Greg Ward's HDR JPEG format
* pfsin/out does not handle %d patterns for ppm files
* use http://www.openraw.org/ to load RAW camera images
* autoconf test for qt causes only problems - replace it with
   something better

* bug to fix: when pfs_read_luminance executed twice in a row, the
   second invocation fails, returning EOF
   
