Logging updates

[shuds13]

Showing worker node with local comms can confuse users.

Only show worker node in the log when running in a distributed mode (e.g., MPI comms).

Also only report manager/worker initialization with debug logging.

This also adds a VDEBUG logging level for logging of communicating log messages, as this is rarely needed and is very verbose.

Removes unhelpful Uneven groups warning

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.95%. Comparing base (065134f) to head (eab18b3).
Report is 20 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1486      +/-   ##
===========================================
+ Coverage    90.93%   90.95%   +0.02%     
===========================================
  Files           76       76              
  Lines         7678     7684       +6     
  Branches      1139     1140       +1     
===========================================
+ Hits          6982     6989       +7     
  Misses         534      534              
+ Partials       162      161       -1     

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