renamed PumpData to MoverData
added more default values and updated documentation of MoverData
Moved MoverData from FlowMachine_Nrpm to FlowMachineInterface.
Edited the use of existing records to avoid errors when trying to overwrite default values.
added an example of a Pump model using the MoverData record.
Made package 'medium' in FlowMachine_ZeroFlow replaceable to be able to use the Medium water in this new example