Update dq for q summing

[mdoucet]

When summing in Q, the resolution should be computed differently. The geometric part is only related to pixel size.
This PR add this to the Q-summing option. It also cleans up the output files.

[backmari]

Could you please add a small unit test for compute_resolution with q_summing? The code changes look fine to me.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.87%. Comparing base (b664256) to head (dbb1aea).
Report is 18 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next      #53      +/-   ##
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+ Coverage   83.87%   85.87%   +2.00%     
==========================================
  Files          20       20              
  Lines        2431     2478      +47     
==========================================
+ Hits         2039     2128      +89     
+ Misses        392      350      -42     

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