Modifying the method to set char model for coal combustion. CHar model is given by "Particles: CharModel: Name:". Three char models are available: GasifOxid, CCK and OFF. When "GasifOxid" is chosen, "GasificationModel" and "OxidationModel" need to be given by "Particles: CharModel: GasificationModel: " and "Particles: CharModel: OxidationModel: ". If CCK model is chosen, the sensitivity of the model can be turn on/off by "Particles: CharModel: SensitivityOfCCK:" (default is OFF).