Update to 3.3.79
    
    - New upstream release 3.3.79
      - Disable accelerator keys in twinwave single window mode to avoid focus
        conflicts
      - Fixes for -fstrict-aliasing and other recent warnings
      - Added fill_waveform rc variable and corresponding menu option
        (/View/Show Filled High Values) to allow filling in the lower portion of
        high values for increased visibility