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use notes.py to build list of tracked notes files.
tweaks and new utils.
upgraded ack
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notes.py -- search index for notes and find notes files to track.
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doc
big list of latex includes (and a failed attemp to read them from a file).
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don't update on bash initialization

cache completions in /home/timv/.completions
moved notes into a bash function.
Add --top option to filter.py. This option runs the ``on-unique`` hook.
better spell-checking for latex and org-mode documents.
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