Extended Data on Measurement Units in Product and ChequeSale

In the API V9Preview2, in the interface IProduct, the property MeasuringUnitName has been replaced with MeasuringUnit of type IMeasuringUnit, which stores more information.

In the class ChequeSale, a property MeasuringUnit of type MeasuringUnitInfo has been added. This property can be modified by plugins and therefore does not have an Id field to avoid confusion and not to link it with the actual MeasureUnit.