+0.5.4 - 6/4/2000
+ Simpilifed endian handling
+
+0.5.4-b3 - 6/1/2000
+ Added support for 64-bit (IA64) CPU
+ Removed broken B-spline interpolation
+ Added support for cygwin platform under Windows 2000
+ Added support for 16-bit PNG graphics
+
+0.5.4-b2 - 5/16/2000
+ Added compile-time configuration of endian order
+
+0.5.4-b1 - 5/14/2000
+ Modified the raysum file format to be platform independent
+
+0.5.3 - 5/11/2000
+ Added Microsoft VC compatibility
+ Cleaned up compilation warnings in libgraph
+
+0.5.2-b5 - 5/7/2000
+ Continued conversion to ANSI C
+ Removed old CRT routines
+
+0.5.2-b4 - 5/4/2000
+ Renamed pictures to phantoms, objects to phantom elements
+ Continued code cleanup
+
+0.5.2-b3 - 4/30/200
+ More code cleanup with reorganizing libraries
+ Added --log and --exp to sdf-1
+ Allowed negative numbers for window levels in CGI interface
+
+0.5.2-b2 - 4/30/200
+ Continued code cleanup
+
+0.5.2-b1 - 4/29/2000
+ Fixed a few MPI bugs
+ Better documented, coded raysum in-memory on on-disk options
+