Bug fixes etc.

- logarithmic scaling used in certain plots (ADD_output.m)

- do not use smaller or larger diameters when calculating deposition
velocity than covered by the model (Rannik_depo.m)

- Prevent dispersion along the z-axis when the plume reaches inversion
layer (agglo_disp_driv.m & plume_conc.m). NOTE: boundary layer height
can be given as an optional input ('plume.BLH'  variable)

- Fixed bugs/errors in calculating the loss of pollutant due to
deposition (plume_conc.m)