* differentiated Valve::setValveCoeff from PressureController::setPressureCoeff
and introduced MassFlowController::setMassFlowCoeff for consistency.
* introduced FlowDevice::setTimeFunction and FlowDevice::setPressureFunction to
differentiate time-dependent and pressure-dependent functions.
* introduced arbitrary pressure dependence for PressureController
* deprecated FlowDevice::setFunction which is replaced by time and pressure
specific functions.
* introduced properties Valve.valve_coeff / PressureController.pressure_coeff /
MassFlowController.mass_flow_coeff in Cython interface and deprecated
Valve.set_pressure_coeff / PressureController.set_pressure_coeff
* deprecated corresponding function calls in clib interface
* deprecate FlowDevice.setParameters (which was only used by MATLAB interface)
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