Add support for multiplying `Units` objects by numerical types to upgrade to a `Quantity` instance. Also, add support for accessing parameters as attributes of a `UnitDispenser`.
Add support for multiplying `Units` objects by numerical types to upgrade to a `Quantity` instance. Also, add support for accessing parameters as attributes of a `UnitDispenser`.

matthewwardrop/python-parampy,matthewwardrop/python-parampy