Fix some annoying behaviour:
* Do not overwrite the cluster selection(s) when the reservation info comes in; that takes 5-10 seconds, and if the user has already made the selections, leave them alone. * More generally, we draw the cluster selectors multiple times, and we were losing the previous selection. Sure, if the user selects a cluster and the constraint checker says it is not allowed, then its okay to change it (might change my mind on this). But trying too hard is annoying. Get rid of a bunch of debugging console prints.
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