Added several test arrays which can be used to compare transforms, they can be found in the directory "test_data". Updated comments and documentation text for much of the Waveform class. Removed the arithmetic operators from the Waveform class because they lack any obvious physical meaning. Removed unnecessary comparisons within the Waveform::ValidateDomain function. Note: I'm considering removing all of the iterator access functions for reasons described in that section. Also, I'm not sure that the copy-assignment operator is working (either properly or at all), but that's what I'm tackling next.