View showing messages grouped by size

[rbuch]

Original issue: https://charm.cs.illinois.edu/redmine/issues/1004

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Sanjay requested a view that would show the total number of messages in certain sized buckets and that would elide empty spaces between messages.

Histogram does this to some degree, but I think the intent is to make it a bit more sophisticated.

[ericjbohm]

Original date: 2018-05-09 16:05:06

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Assigned to Ronak, but this seems like a good intern project.