Minor tweaks to Hooke's [command stacks][stacks].  I can now execute
the GUI alternative of

    ./bin/hk.py 
        -c 'new_playlist'
        -c 'glob_curves_to_playlist *'
        -c 'start_command_capture'
        -c 'zero_surface_contact_point --block retract'
        -c 'stop_command_capture'
        -c 'apply_command_stack_to_playlist'
        -c 'curve_info'
        -p

Issues resolved today:

- GUI-generated commands clogging the command stack instead of
  being executed.  Fixed with CommandMessage.explicit_user_call.
- Playlist._loaded desyncronization from old 'apply command stack
  to playlist'.  Fixed with Playlist.unload().

Update:

After [fixing up a few more bugs][bugs], I successfully ran:

    ./bin/hk.py 
        -c 'new_playlist'
        -c 'glob_curves_to_playlist *'
        -c 'start_command_capture'
        -c 'zero_surface_contact_point --block retract'
        -c 'flat_filter_peaks --block retract --min_points 1'
        -c 'zero_surface_contact_point --block retract --ignore_after_last_peak_info_name "flat filter peaks"'
        -c 'convert_distance_to_force --block retract --deflection_column "surface deflection (m)"'
        -c 'remove_cantilever_from_extension --block retract'
        -c 'flat_peaks_to_polymer_peaks --block retract'
        -c 'polymer_fit_peaks --block retract'
        -c 'stop_command_capture'
        -c 'apply_command_stack_to_playlist --enable-evaluate'
        -c 'save_playlist --output o.hkp'

on 2400 curves with the command line UI.  Tomorrow I'll run through
those with the GUI.

Update:

I ran through with the above command with the GUI.  Same results :D.
It did, however turn up a couple of outstanding issues:

- lots of useless `!!python/unicode 'retract'` tags.  If the strings
  are all in ASCII, I don't really care if they are loaded as unicode
  or string objects.
  ([fixed][])
- `surface distance (m) (m)` column.  Obviously someone is adding
  units twice.  I need to figure out who it is ;).
  ([[Reproduced|Hooke-update-2]])

[stacks]: http://git.tremily.us/?p=hooke.git;a=commit;h=e57e6aa9b86351398b3af9a24513169395a71522
[bugs]: http://git.tremily.us/?p=hooke.git;a=commit;h=ae0184d8c8ffe1c1ac2f811ded7f5b81d04aeb0b
[fixed]: http://git.tremily.us/?p=hooke.git;a=commit;h=608071d67afc1775941505c6684d31a279f041a0

[[!tag tags/hooke]]
[[!tag tags/programming]]