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dS(	s&Fixer for has_key().

Calls to .has_key() methods are expressed in terms of the 'in'
operator:

    d.has_key(k) -> k in d

CAVEATS:
1) While the primary target of this fixer is dict.has_key(), the
   fixer will change any has_key() method call, regardless of its
   class.

2) Cases like this will not be converted:

    m = d.has_key
    if m(k):
        ...

   Only *calls* to has_key() are converted. While it is possible to
   convert the above to something like

    m = d.__contains__
    if m(k):
        ...

   this is currently not done.
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            | arglist<(not argument<any '=' any>) arg=any ','>
            )
            ')'
        >
        after=any*
    >
    |
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        'not'
        anchor=power<
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                )
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            >
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