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For the ``future`` package.

Adds this import line:

    from __future__ import division

at the top and changes any old-style divisions to be calls to
past.utils.old_div so the code runs as before on Py2.6/2.7 and has the same
behaviour on Py3.

If "from __future__ import division" is already in effect, this
fixer does
nothing.
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    __future__.division redefines the meaning of a single slash for
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    so we match that and only that.
   
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        Skip this fixer if "__future__.division" is already
imported.
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        Since the tree needs to be fixed once and only once if and only if
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        matches, we can start discarding matches after the first.
       
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