Merge pull request #354 in VECTO/vecto-sim from...

Merge pull request #354 in VECTO/vecto-sim from ~EMQUARIMA/vecto-sim:feature/VECTO-421-volume-related-results to develop

* commit '04e1b278':
  update user manual on vsum file
  adding test-data
  adapt testcases
  update testdata: new column in sum-file
  add cargo volume to vehicle data, add new columns to summary data, pass-through cargo volume from vehicle data to sum data
  update segmentation table: fix loading & cycles for class 11 & 12
  add cargo volume to body&trailer weights (CSV-file), add cargo volume to mission segments, add unit test to check total cargo volume