Adjust TransfoParam_GR5H (X2)

There might be an issue with the transformation of X2 in GR5H. The transformation of X2 (from T to R) in TransfoParam_GR5J and TransfoParam_GR5H is: ParamOut[, 2] <- sinh(ParamIn[, 2])

For both models, the calculation of potential intercatchment semi-exchange is: EXCH=Param(2)*(St(2)/Param(3)-Param(5))

X2 is in mm/timestep, which means that X2 is timestep dependant. The calculation of hourly potential intercatchment semi-exchange is calculated differently by Le Moine, 2008, p. 173.

The distribution of X2 over 229 catchments changes when dividing X2 by 24 in the fortran code.

Most X2 values were equal to -0.04 mm/h, which is one of the prefiltering values.