Fix counting of OutgoingLocations

[pylipp]

https://trello.com/c/W4BajG3l

• Don't overcount DonatedLocations when boxes moved on different days
• Exclude OutgoingLocations with only reverse box flows

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.70%. Comparing base (ea45391) to head (767c32e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2884   +/-   ##
=======================================
  Coverage   73.70%   73.70%           
=======================================
  Files         330      330           
  Lines       25319    25319           
  Branches     2485     2485           
=======================================
  Hits        18661    18661           
  Misses       6607     6607           
  Partials       51       51           

Flag	Coverage Δ
backend	99.61% <ø> (ø)
frontend	66.85% <ø> (ø)
sharedComponents	27.87% <ø> (ø)

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