Create and write audit trail log to a configurable destination

[lisakaser]

3 story points

acceptance criteria 1:
Given:
When: run MetGenC
Then: every granule has a log output summarizing metrics (success/fail; when/how long; error reason)

acceptance criteria 2:
Given:
When: run MetGenC
Then: show a summary of number of granules, how many success/fail, error reason

acceptance criteria 3:
Given:
When: run MetGenC
Then: for every error log all detailed information for possible cause of error

NOTE: This story can conclude with a functional example of each three acceptance criteria - details can be added along the way when we find more errors/metrics that need output or tracking

[lisakaser]

Ops preference: log file plus output directly while running
Suggestion to add a quiet option - should be separate issue for later.

[eigenbeam]

To test, you can run metgenc and inspect the stdout info that will scroll by, and also inspect the logfile that will get created named, creatively, metgenc.log.