Rename Field refactoring allows you to rename a local field with the method name

[jonhnanthan]

Rename Field refactoring allows the use of the name of the recursive method in the field inside the same method.
It would be nice if Rope could emit an alert to the user to confirm the operation to avoid type errors

Steps to reproduce the behavior:

1. Code before refactoring:

def pluralize(word, pos="NN", custom={}, classical=True):
    if word.endswith("'"):
        owners = pluralize(word.rstrip("'s"), pos, custom, classical)
        if owners.endswith("s"):
            return owners + "'"

    words = word.replace("-", " ").split(" ")
    return word.replace(words[0], pluralize(words[0], pos, custom, classical))

2. Apply the Rename Field refactoring with the new name 'pluralize' to the 'owners' field.

[lieryan]

Closing. Ticket merged into #779.