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