quite a few changes. I thought about making this 4.5 but not yet since
these are mostly maintenance items, with a few new features as well:
  * UI Features:
       + Added "File->Save-as CSV" in the Frequency Plots window
       + Added optimizer output config checkboxes for csv, s1p, and/or
         s2p. Now you can auto-generate .csv, .s1p, or .s2p files when
         the input .NEC file is modified by an external program.
       + Pre-processed CSV data for each example .NEC file and placed
         them in examples/data/. You can view these with any
         spreadsheet program and graph columns as you like; the data is
         useful for regression testing, too.
       + Updated optimization documentation.
  * Console Features:
       + Refactored console output based on output priority levels.
         Console output is now color coded and output level can be
         controlled with -v and -d options. See --help for details.
       + Add batch mode (-b) commandline flag.
       + Added commandline options --write-csv, --write-s1p,
         --write-s2p-max-gain, and --write-s2p-viewer-gain for use with
         --batch and the optimizer.