FLOW                                                                    NEWS
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December 2020, flow 1.5
  . Fix color order from BGR to RGB for polygon

August 2017, flow 1.4
  . Support SPICE Toolkit N0066
  . Fix rendering bug on projection

1 September 2015, flow 1.3
  . Change the Z-axis of a depiction from the Z-axis of an instrument frame
    to a boresight vector
  . Use Mars B.C. instead of the Mars mass center for DE43x
  . Fix coverage listing bug in flow_cov

15 May 2015, flow 1.2
  . Fix the fits WCS header when -f option is used
  . Add flow_cov program for coverage check

16 May 2014, flow 1.1
  . Fix the simulation when FOV shape is CIRCLE or ELLIPSE
  . Support sky_color option in the configuration
  . Show effective options when the configure script finishes

17 Dec 2012, flow 1.0

- Simulation Engine:
  . First release for public

- Rendering Engine:
  . First release for public
