Generated code: duplication of create_*() methods

[christophe-david]

Considering the analysis Foo with the Bar discipline, in the code that WhatsOpt 1.14.3 generates, we have:

class FooBase(Group):
    ...
    def create_bar(self):
        return Bar()

and

class FooFactoryBase(object):
    ...
    def create_bar(self):
        return Bar()

Therefore, one that would want to overload create_bar() should do it twice, in Foo and FooFactory, which is not DRY.