add convolutions to GUI

Participants to the design: @ndcn0236 @hossein @saad

The GUI might looks like this:

SLIDER : # compartments

• list of diffusion compartments
• parmas per compartment sliders

FOD slider for number of crossings (default=0) Radio buttons (number = number of compartments)

In bokeh:

compartment_row = row()
for each compartment:
    compartment_row.append(column(selector, param_sliders))

odf_param_row = row(column(fibre orientation 1), column(fibre orientation 2))
     
full_column = column(ncompartment_slider, compartment_row, odf_radio_button_row, ncrossing_slider,  odf_param_row)