The commit introduces new functionality in the bundle that allows storing the closing motive when a course is closed. This is achieved by modifying the model and database schema to include a new `closingMotive` field in AccompanyingPeriodStepHistory entity.
Each time a step is changed on an history, a record is stored in a
dedicated table.
When the acp's opening date is moved, the first row is adapted to match the new opening's date. This
mechanisme does not work if the opening date is move beyon the first end
date (if any), nor on the closing date.