Moved hist.py and base_data.py to fits.py.
fits module importable and semi cleaned up.
Made GBTSpecBlock
Unit tests for fits.SpecBlock.
Added missing unittest files.
Updated .gitignore.
renamed utils.py to file_utils.py
Removed unittests for deleted module.
Added GBT old spectrometer test data.
Initialization and setup of SpecReader working.
SpecReader now mostly works except history.