Added merge of multiple sections in a GVL

[RobertoRoos]

Resolves part of

• GVL uses only the first variable List #32

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.09%. Comparing base (ef7df1d) to head (f6cd688).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
- Coverage   84.39%   84.09%   -0.30%     
==========================================
  Files          10       10              
  Lines         737      742       +5     
==========================================
+ Hits          622      624       +2     
- Misses        115      118       +3     

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