Finish porting namelist documentation and add any missing entries

[David Dickinson]

We have not yet ported all of the existing namelist documentation from http://gyrokinetics.sourceforge.net/wiki/index.php?title=GS2_Input_Parameters to our in code documentation. Even when we do port all of this over there will be many inputs not documented. We should address that for release 8.1

• ballstab_knobs
• collisions_knobs
• dist_fn_knobs
• dist_fn_species_knobs
• driver
• eigval_knobs
• fields_knobs
• gs2_diagnostics_knobs
• hyper_knobs
• ingen_knobs
• init_g_knobs
• init_knobs
• knobs
• kt_grids_box_parameters
• kt_grids_knobs
• kt_grids_range_parameters
• kt_grids_single_parameters
• kt_grids_specified_element
• kt_grids_specified_parameters
• layouts_knobs
• le_grids_knobs
• nonlinear_terms_knobs
• normalisations_knobs
• optimisation_config
• parameter_scan_knobs
• parameters
• reinit_knobs
• source_knobs
• species_knobs
• species_parameters
• stir
• theta_grid_eik_knobs
• theta_grid_file_knobs
• theta_grid_gridgen_knobs
• theta_grid_knobs
• theta_grid_parameters
• theta_grid_salpha_knobs

is complete

is partially filled

is missing

[David Dickinson]

Closed by PR 471