require acceleration curve to be valid (case then .vacc file is not valid is handled in the cach-block

Merge pull request #275 in VECTO/vecto-sim from ~EMKRISPMI/vecto-sim:feature/VECTO-356-crosswindcorrectiondelta-for-t1-trailer to develop

* commit '47619f62':
  T1 deltaCdA changed from 1.1 to 0.6

Merge pull request #274 in VECTO/vecto-sim from ~EMKRISPMI/vecto-sim:feature/VECTO-323-pto-idle-losses to develop

* commit 'bf419636':
  Angular Gear --> Angledrive
  User Manual for PTO updated
  Added PTO documentation in user manual
  deleted modfile and sumfile in pto generic vehicle
  PTO column names changed in SUM File, and also added in user manual
  PTO: added info that it can only be used in Engineering Mode
  PTO tests: updated "Schieberad" to "sliding gearwheel"
  corrected tests, updated mod files
  updated tests to new modfile-format
  PTO: updated user manual
  VectoCSVFile: Faster writing of CSV files
  auxiliary: PTO now not considered in AUX-Sum column
  PTO aux columns: removed "aux" in title. P_aux_CYCLE added (for direct cycle auxiliary)
  AddComponent for Gearbox: Removed PTO parameter

Merge pull request #273 in VECTO/vecto-sim from ~EMQUARIMA/vecto-sim:feature/VECTO-354-separate-writing-json-files-into to develop

* commit 'd3c18b18':
  allow multiple solutions for torque converter operating point, select appropriate
  avoid opening non-json files
  update project fiels
  update project files
  fix: reading engine-only jobs
  add plugin mechanism
  moving plugin registry to VectoCommon
  merge writing json files
  separating writer into dedicated class, adding plugin mechanism for importing/exporting

Conflicts:
	VECTO/VECTO.vbproj