Renamed DynamicMap 'closed' mode to 'bounded'

[jlstevens]

PR title says it all.

As far as I know, we are aware of (and can update) all code that may have used DynamicMap up until this point...

[jlstevens]

Mathematically 'closed' and 'open' isn't the same as 'bounded' and 'unbounded'. I've left 'open mode' alone as I think 'unbounded' is too long and 'open' has fairly natural semantics (as opposed to 'closed' versus 'bounded').

@jbednar @philippjfr Any thoughts on this? This is our last chance to change it! I think 'counter' mode is unproblematic unless you feel there is something better. Maybe 'step' mode?

[philippjfr]

Sounds clearer to me and there isn't much backward compatibility to worry about. I'll merge unless @jbednar raises any objections in the next few minutes.

[jlstevens]

Yes, please merge as I have another PR that will operate on the same file.

[philippjfr]

Okay, too late for objections :) I'll merge

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