NCAR / manage_externals / 86

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Add command line option to disable logging

Add command line option, --no-logging, to disable logging to a file. In this
mode, debug and info level output from subprocess commands is dropped, and only
warning, error and critical output is output to the screen.

Testing:
  make test - all tests pass, one test skipped

  manual testing - run with --no-logging, no log file written to disk. Error
      level log written to screen, info level dropped.

560 of 622 branches covered (90.03%)

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1858 of 1966 relevant lines covered (94.51%)

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