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it still works)

unicode, so better check against a non-unicode string.

fixes #806

with a much narrow window (1/50th of the whole width).

central place.

refs #768

fixes #768

fixes #767

* draw_graph() now only handle a 'fig', the caller is responsible for
  width/size/filename if a file is written
* more sync' with hgactivity draw.py
* sort dates in collect_data() rather than in draw_graph()

fixes #766

fixes #667