ace BSD attribution

[gordonwoodhull]

We've copied chunks of code out of Ace, which is under the BSD license, in order to modify the behavior.

This is perfectly fine, but we should abide by the attribution clause and give credit where it's due.

I'd like to find a way to do this without copying their entire license into every source file where we use it.

Maybe a comment at the top of those files (e.g. cell_view.js, ui_utils.js) with a link to their license, is enough?

[martymcenroe]

maybe a menu choice on the upper right "About" that could pop open some messages about github, rcloud.social, benevolent dictator(s) and then whatever attributions as a clickable link