Fix the Makefile that builds melange back pressure notes.
ice_bib.bib is pure ASCII (sans UTF-8 characters) now.
Do not build docs for TAO-based modules if TAO is not available.
Update -subgl docs. Use -subgl to interpolate basal melt rate.
(Mostly) whitespace changes.
Remove unused GPBLD options.

This removes -ice_gpbld_water_frac_coeff and
-ice_gpbld_water_frac_observed_limit.

The knobs are still there (just use the config file).
Remove the undocumented "-cts" option.

The diagnostic itself is still available in -extra_files.
Remove undocumented "-liqfrac" and "-temp_pa" options.

Diagnostics are still available in -extra_files.
Remove most of -pdd_... command-line options.

Options -pdd_factor_snow, -pdd_factor_ice, -pdd_refreeze, -pdd_std_dev,
-pdd_positive_threshold_temp are gone.

Please use configuration parameters.
Fix typos.
Update command-line options in manuals.

I went thought ~200 command-line options today, checking their
documentations.

Below is a list of options that are not documented. Some of them should
remain undocumented, some should be removed altogether.

24 are documented as configuration flags or parameters under the same or
very similar name (but not documented as options):

- -bed_def_lc_elastic
- -brutal_sliding
- -brutal_sliding_scale
- -cfl_eigencalving
- -e_age_coupling
- -high_tauc
- -hydrology_cavitation_opening_coefficient
- -hydrology_creep_closure_coefficient
- -hydrology_regularizing_porosity
- -hydrology_roughness_scale
- -ice_grain_size
- -institution
- -inv_log_ratio_scale
- -nuBedrock
- -part_grid_reduce_frontal_thickness
- -sliding_scale
- -ssa_dirichlet_bc
- -summary_area_scale_factor_log10
- -summary_vol_scale_factor_log10
- -tauc_slippery_grounding_lines
- -tikhonov_atol
- -tikhonov_ptol
- -title
- -write_fd_fields

29 are not documented anywhere (except possibly in the code):

- -Nx
- -Ny
- -append (pismv, SSA test executables)
- -bedrock_is_ice (pismv)
- -count_steps
- -fracture_softening
- -fractures
- -grain_size_age_coupling
- -init_P_from_steady
- -input_to_bed_period
- -input_to_bed_reference_year
- -inv_gn_iter_max
- -low_temp
- -max_low_temps
- -pause
- -procs_x
- -procs_y
- -regrid_bed_special
- -report_file (pismv, SSA test executables)
- -ssa_basal_q (SSA test executables)
- -ssa_glen_n (SSA test executables)
- -ssafd_matlab
- -tauc_to_phi
- -tikhonov_adaptive
- -varc
- -vark
- -view_sys
- -wait_for_gdb
- -zero_grad_where_no_model