Bug: Schema.moveField( ... after ) does incorrect reordering.

Suppose I have a schema S with fields F0, F1, F2. Then I expect
  S.moveField( 'F0', after='F1')
to reorder the fields
  F1, F0, F2,
but instead it reorders them
  F1, F2, F0.

This is because the method calls
  S._moveFieldToPosition('F0', pos=2),
which deletes F0
  F1, F2
and then adds F0 to position 2
  F1, F2, F0


Suggested fix:
    def _moveFieldToPosition(self, name, pos):
        """Moves a field with the name 'name' to the position 'pos'

        This method doesn't obey the assignement of fields to a schemata
        """
        keys = self._names
        oldpos = keys.index(name)
        keys.remove(name)
        if oldpos >= pos:
           keys.insert(pos, name)
        else:
           keys.insert(pos - 1, name)
        self._names = keys


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