Print final velocity components

[reinhold-willcox]

Added the components of the velocity vector for a given star to possible output, as requested by @TomWagg

[reinhold-willcox]

These output variables are not included by default. To access them without modifying the source code, you should use the logfile-definitions option:

COMPAS --logfile-def LOGFILE.txt

=== LOGFILE.txt ===
 BSE_SNE_REC += {
     SUPERNOVA_PROPERTY::VELOCITY_X,
     SUPERNOVA_PROPERTY::VELOCITY_Y,
     SUPERNOVA_PROPERTY::VELOCITY_Z,
     COMPANION_PROPERTY::VELOCITY_X,
     COMPANION_PROPERTY::VELOCITY_Y,
     COMPANION_PROPERTY::VELOCITY_Z,
 }

[ilyamandel]

Thank you, @reinhold-willcox !

But I am not a huge fan of calling it SPEED_X, etc. Elsewhere in the outputs, we always use VELOCITY for 3-d vectors and speed for scalars. Can we retain that for consistency?

[reinhold-willcox]

@ilyamandel Fixed

[ilyamandel]

Thank you, @reinhold-willcox