+2.0.0 - 7/07/00
+ Update trace level processing
+ Added trace level to SignalFilter
+
+1.9.9 - 7/04/00
+ Fixed const issue with ImageFileArray
+ Fixed Array2dFile::labelsCopy()
+ Added copy constructor and assignment for Array2dFileLabel class
+ Added Timer to if-2.cpp and ifinfo.cpp
+ Added beginning of frequency-based (DFT & FFT) filter to SignalFilter
+ Added option processing for filter-method for pjrec to choose
+ between convolution, dft, & fft filtering
+ Fixed format string for EZPlot so axis labels now print
+
1.9.8 - 6/27/2000
Rewrote Array2dFile class to be non-templated
Rewrote Array2dFile class to make reads and writes atomic. No disk files are kept open.