Found a bug in ForInfoListT object, closes #1766

[GillesDuvert]

contrary to its intent, the loop number did not start at 0 but at 32 (the initialized default size), and would be constantly increasing in size at each new level of nested loop (remember, ForInfoListT was designed exactly for the contrary!). May even had an incidence on the loop speed.

For the record, using a simpler std::vector would be a lot less worry but would crash when the type of the loop iterator would change during the loop, which happens (see #1540).

[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 42.66%. Comparing base (1251608) to head (ebfa961).
Report is 4 commits behind head on master.

Files	Patch %	Lines
src/envt.hpp	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1778      +/-   ##
==========================================
- Coverage   42.70%   42.66%   -0.05%     
==========================================
  Files         361      361              
  Lines       97331    97334       +3     
  Branches    19928    19928              
==========================================
- Hits        41570    41526      -44     
- Misses      55761    55808      +47     

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