"To FXP" must accept array data

[altenbach]

For some reason, the conversion bullet for fixed point (FXP) does not accept array inputs, so if we have array data, we currently need to wrap FOR loops around it.

 Suggestion: Allow array inputs for "to FXP" to make it consistent will all other conversion bullets.

(see also this post for an applied example).

[AndyKr]

Also urgently needed here. Bad to create a for-loop each time.