New structure - test/ folder

[laurentheirendt]

Continuation of PR #681.

[codecov-io]

Codecov Report

Merging #811 into develop will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #811      +/-   ##
===========================================
+ Coverage    27.82%   27.82%   +<.01%     
===========================================
  Files          741      741              
  Lines        49570    49570              
===========================================
+ Hits         13791    13793       +2     
+ Misses       35779    35777       -2

Impacted Files	Coverage Δ
src/analysis/rFBA/dynamicRFBA.m	90.32% <0%> (-1.08%)	⬇️
src/base/io/utilities/model2xls.m	80.32% <0%> (+1.63%)	⬆️
src/base/io/utilities/convertOldStyleModel.m	82.08% <0%> (+2.98%)	⬆️

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