U configure.in	still doesn't help me to setup libtiff properly (tk)
U read_tiff.c	should learn how to handle float channels (tk)
U read_tiff.c	should learn how to handle pixarlog (tk)
U read_tiff.c	should interpret the special pixar tags to load renderregions (tk)
U read_sgi.c	needs grayscale image tests (tk)
C read_ct.* 	reader for MentalRay / XSI images (tk)
C read_pic.*	reader for Softimage images (tk) 
