Added Hooke-update.mdwn and tags/hooke

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+Minor tweaks to Hooke's [command
+stacks](http://www.physics.drexel.edu/~wking/code/hg/hgwebdir.cgi/hooke/rev/8c0882dfbaf5).  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:
+
+1) GUI-generated commands clogging the command stack instead of
+   being executed.  Fixed with CommandMessage.explicit_user_call.
+2) Playlist._loaded desyncronization from old 'apply command stack
+   to playlist'.  Fixed with Playlist.unload().
+
+[[!tag tags/hooke]]
+[[!tag tags/programming]]