Store DEBUG logs in file in superdataset

[jwodder]

Closes #121.

[codecov]

Codecov Report

Merging #122 (5c06fde) into draft (e19acd7) will decrease coverage by 1.13%.
The diff coverage is 29.16%.

@@            Coverage Diff             @@
##            draft     #122      +/-   ##
==========================================
- Coverage   70.11%   68.98%   -1.14%     
==========================================
  Files           7        7              
  Lines         900      922      +22     
  Branches      139      140       +1     
==========================================
+ Hits          631      636       +5     
- Misses        228      245      +17     
  Partials       41       41              

Impacted Files	Coverage Δ
tools/backups2datalad/__main__.py	0.00% <0.00%> (ø)
tools/backups2datalad/datasetter.py	59.68% <30.43%> (-3.25%)	⬇️

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[yarikoptic]

thank you @jwodder -- let's see it in action!