Explicit override for 20-element limit for array display

[SteveMyres]

Request a syntax to explicitly override the 20-element array display limit similar to the way you can subset into Persist data.  Maybe make it something involved enough that it's unlikely to get entered accidentally, and maybe even have a backup limit of 200 elements or something even with the override, so someone doesn't try to display 10K values every refreshing 100ms or something.

Thanks!