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sending YES will write the given animation to file after call to STATE_engine_save() with SAVE_ONLY_WHATS_NEEDED
Note that if STATE_engine_save() is called without SAVE_ONLY_WHATS_NEEDED, all the animations will be saved
Note ! If the animation is used directly by one of the polygons
in the saved group it will be saved no matter how the save_flag is set !
The need for this function is because though the engine can figure out itself
what animations are needed to the saved group it doesn't know what animation will
be needed in run time. Using this flag one can determine the animation resources
to use in run-time.
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