+1.9.7 - 6/25/2000
+ Standardized string option processing by classes. All classes use character strings
+ to select options rather than numeric constants. Added fail() and failMessage()
+ methods to verify that objects are created correctly by character strings.
+ Hid C++ assignment and copy constructors in classes that should not have assignment/copy
+ Rewrote ImageFile class
+ Started support for dmallocxx library, not finished
+ Added G.T. Herman image comparision statistics to ifinfo (see imagefile.cpp)
+ Updated ifinfo to show comparative statistics
+ Added printLabels() to Array2dFile class
+ Added printStatistics() to ImageFile class
+
1.9.6 - 6/22/2000
Moved conversion filter name/id to Filter class
Moved conversion backprojection name/id to Backproj class