Present inter-node communications volume

[lars-t-hansen]

The context here is the second paragraph of #6 (comment):

There are two network connections between each node. One is the type InfiniBand . If there were lot of data transfers between nodes, InfiniBand should have been used. For cases where just the variable state updated, this is not important.

• Log communications volume NordicHPC/sonar#67
• Sonarlog ingestion code and possibly data cleanup
• Add presentation of communications volume to sonalyze output, plus query options

Probably the query options will be something like "at least this much communication volume" and "communications substrate chosen".