fix restart and add methods with include files

[joergbuchwald]

Fixes #52

• reorganize add element functionalities

[codecov[bot]]

Codecov Report

Merging #53 (83f387d) into master (e4503ad) will decrease coverage by 0.65%. The diff coverage is 56.25%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
- Coverage   66.97%   66.31%   -0.66%     
==========================================
  Files          21       21              
  Lines        1426     1413      -13     
==========================================
- Hits          955      937      -18     
- Misses        471      476       +5     

Impacted Files	Coverage Δ
ogs6py/ogs.py	64.53% <56.25%> (-2.30%)	:arrow_down:

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