Function which transforms model parameters of the GR1A model (from real to transformed parameters and vice versa).
TransfoParam_GR1A(ParamIn, Direction)[numeric] matrix of parameter sets (sets in line, parameter values in column)
[character] direction of the transformation: use "RT" for Raw -> Transformed and "TR" for Transformed -> Raw
ParamOut [numeric] matrix of parameter sets (sets in line, parameter values in column)