Fix a failing test, which was failing due to modifying a list in plac…

[alexgleith]

Added a little test case to test single files. Discovered the issue is in the main_aggregator function modifying a list in place. Could be unique to my Python version, but wanted to send it in anyway.

Most of these changes are formatting... sorry about that.

[codecov[bot]]

Codecov Report

Merging #169 (49d2354) into master (c695897) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #169      +/-   ##
==========================================
+ Coverage   84.88%   84.90%   +0.02%     
==========================================
  Files          12       12              
  Lines        1131     1133       +2     
  Branches      156      156              
==========================================
+ Hits          960      962       +2     
  Misses        152      152              
  Partials       19       19              

Impacted Files	Coverage Δ
...tools/timeseries_products/aggregated_timeseries.py	95.18% <100.00%> (+0.05%)	:arrow_up:

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[alexgleith]

I've split this into two commits @mhidas

[mhidas]

What about something as simple as this? #172