in case eta for REESS correction cannot be calculated (no charge/discharge situations) set correctable energy to 0

Merge in VECTO/vecto-dev from VECTO/mq_vecto-dev:develop to develop

* commit 'bac6f133':

Merge in VECTO/mq_vecto-dev from feature/VECTO-1453-battery-time-dependent-internal-resistance to develop

* commit '381693d7':
  fix some testcases, hybrid stragety: calc aux energy for aux connected to REESS (approx.)
  bugfixes after extending battery to batterysystem
  update battery state in test powertrain
  implementing time-dependent internal resistance

Merge in VECTO/vecto-dev from VECTO/mq_vecto-dev:feature/VECTO-1453-battery-time-dependent-internal-resistance to develop

* commit '381693d7':
  adding missing file to documentation
  fix some testcases, hybrid stragety: calc aux energy for aux connected to REESS (approx.)
  bugfixes after extending battery to batterysystem
  update battery state in test powertrain
  implementing time-dependent internal resistance

# Conflicts:
#	VectoCore/VectoCoreTest/Models/EngineeringMode/EngineeringModeBusAuxTest.cs

Merge branch 'develop' of https://citnet.tech.ec.europa.eu/CITnet/stash/scm/vecto/mq_vecto-dev into develop

# Conflicts:
#	Documentation/BusAuxCases with ESS_Formatted.xlsx

Merge in VECTO/vecto-dev from VECTO/mq_vecto-dev:merge/multistagetool to develop

* commit '41d1e511': (139 commits)
  update battery state in test powertrain
  fix busaux testcases
  use same version of lib also in gui project (json), update testdata
  testcase for single bus simulation - check passenger count calculation
  fix passenger count in single-bus simulation: standing not considered in Coach cycle
  added testcase for passenger count
  update handling of passenger count - sitting / standing
  fix testdata: passenger count
  fix testdata according to new handling of airdrag modified
  ignore testcase no longer useful
  fixing testcases for completed/single bus
  Allow only CreateVifViewModels with unsaved changes to be selected for simulation
  Added backing storage to CreateVifViewModel
  Added Teardown method to backingstorage tests
  Updated Backing storage and added tests
  Added Backing storage to monitor unsaved changes of viewmodels
  Fixed error in CreateVifViewModel SetinputData
  Allow selection of jobs only if they can be simulated
  Added parameters to ProeprtyNameToLabelTextConverter
  Added missing stages to GUILabels
  ...

(cherry picked from commit ee7abe05)

Merge in VECTO/vecto-dev from VECTO/mq_vecto-dev:feature/VECTO-1452-update-pev-e2-shift-strategy to develop

* commit '93ab1617':
  make min-speed for downshift polygon a parameter
  allow reading pev shift parameters from file
  finetuning PEV shift strategy
  refactoring PEV shift strategy: simplify required methods, prohibit eff-gearshift when at max recuperation, prevent gearshift on drive-off (until target speed reached, em-speed above n_P80low, or operating point at full-load)
  implementing first idea of shift polygons for PEV