CreateInputsModel: deprecate `Qobs` parameter and use `Qinf` instead

There is a confusion between the parameter Qobs used in CreateInputsModel and the parameter Qobs used in CreateInputsCrit. The first one is used to inject "observed" human influences in the model (for nodes of type Reservoir, Direct Injection, or Diversion), the second is used to provide "observed" measured flows at the gauging station for the calibration of the hydrological models.

I propose to use Qinf instead of Qobs for `CreateInputsModel (standing for "influence flows").

TODO:

• Create new parameter Qinf in CreateInputsModel
• Add Qinf <- Qobs if Qobs is provided by the user instead of Qinf
• Disallow the use of both parameter together
• add a warning for deprecating the parameter Qobs