Replace hotfix of actual time.
Changed the actual_time in advance_flow_field and apply_boundary_condition
Commit for Run 1
Commit for Run 1
Removed a wrong time input and changed the output. Commit for Run 1
Commit for Run 2
Commit for Run 3
The addition of half a time step to the actual time is now done in the advance_flow_field. Commit for Run 3