Change energy balances FlowMachine_y

Dynamics with free initial values lead to default start values, which is
to be avoided. Therefore this is changed to fixed initial dynamics. #31
Change energy balances in FlowMachine_dp

To avoid the use of default start values, the energy balances of the flow
machines have been set to fixed initial. #31
Change energy balances in FlowMachines_m_flow

To avoid the use of default start values, the energy balances have been
set to fixed initial. #31
Change energy balances in FlowMachine_Nrpm

To avoid the use of default start values, the energy balances have been
set to fixed initial. #31
Change energy balance in MassFraction example

To avoid the use of default start values, the energy balance has been set
to fixed initial. #31
Change energy balance in Radiator442_2 example

To avoid the use of default start values, the energy balance has been set
to fixed initial. #31
Change energy balances in ThreeWayValves example

To avoid the use of default start values, the energy balances have been
set to fixed initial. #31
Change energy balances in ReverseFlowHumidifier

To avoid the use of default start values, the energy balances in this
example have been set to fixed initial. #31
Change energy balance in Delay example

To avoid the use of default start values, the energy balance has been set
to fixed initial. #31