+1.9.1 - 6/20/2000
+ Converted all file i/o to C++ library
+
+1.9.0 - 6/15/2000
+ Skip versions to make version 2.0 the first C++ version
+ Renamed Raysums to Projections throughout files
+ Renamed Detector to Scanner
+ Converted Scanner and Projecions to full object-oriented
+
+0.6.1 - 6/12/2000
+ Converted Phantom and PhantomElements to Object-Oriented
+ Converted Detector to Object-Oriented
+
+0.6.0-b3 - 6/10/2000
+ Improved Integer backprojection method
+ Fixed nearest neighbor to be truly nearest neighbor
+ Made linear interpolation more integer arithmetic -> speed improvement
+ Finished converting all C files to C++
+ Converted all use of malloc/free to C++ new/delete
+ Began object-oriented conversion of Phantom and Projection structures
+
+0.6.0-b2 - 6/8/2000
+ Converted MPI data structures to C++ object
+ Made ImageFile directly inherit from Array2dFile
+
0.6.0-b1 - 6/6/2000
First C++ conversions
Portable IF (image file) format implemented with objects (SDF removed)