+2.0.0-b3 - 7/10/00
+ Added highly optimized backprojection method idiff3
+ Moved comparative stats to if-2 program from ifinfo
+ Fixed image display in if2img using G2 library
+ Added column-plot and row-plot options to if-2
+ Added autoselection of analytic/calculated spatial responses to SignalFilter
+ Added frequency-based preinterpolation to SignalFilter and idiff3
+ backprojection method. Currently, this technique is still under
+ development and debugging
+ Moved graphic file writing to ImageFile class from if2img program
+
+2.0.0-b2 - 7/07/00