fix: 95-duplicated-imgw-colnames

[bczernecki]

For some of IMGW-PIB datasets which is merged across two files colnames for the same variable have different labels thus require extra curation (i.e. Srednia dobowa temperatura[°C] and Srednia temperatura dobowa [°C]).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.48%. Comparing base (9c168a6) to head (8a944c7).
Report is 5 commits behind head on master.

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HEAD has 4 uploads less than BASE

Flag	BASE (9c168a6)	HEAD (8a944c7)
	5	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #97      +/-   ##
==========================================
- Coverage   82.46%   76.48%   -5.99%     
==========================================
  Files          30       32       +2     
  Lines        1608     1756     +148     
==========================================
+ Hits         1326     1343      +17     
- Misses        282      413     +131     

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