BFI target function
Added BFItarget function to mHM:

opti_function=34
:!> (34) SO: Q: (1 + BFI_o  BFI_s)(1  KGE) !> BFI_s = mean_t(<q_2>) / mean_t(<q_total>) !> BFI_o = given in separate namelist per domain !> <.> is a spatial average
 you can either specify a baseflow index per domain or you can let calculate this by mhm intern with the Eckhardt filter
 a new namelist was added to the
mhm.nml
:!****************************************************************************************** ! SETTINGS FOR OPTIMIZATION for baseflowindex (opti_function = 34) !****************************************************************************************** &BFI_inputs !> Calculate BFI from discharge time series with the Eckhardt filter !> Eckhardt et al. (2008, doi: 10.1016/j.jhydrol.2008.01.005) !> This option **requires** one gauge per domain at the outlet of the basin. BFI_calc = .true. !> baseflow index per domain. Only needed if not calculated (BFI_calc = .false.) !> You can overwrite single BFI values to not calculate them internally (if BFI_calc = .true.). ! BFI_obs(1) = 0.124 ! BFI_obs(2) = 0.256 /
 when calculating internally, you need to have exactly one gauge per domain