[RB] replace senders should look in the hierarchy

[Ducasse]

It looks like the replace sender only look in the class and not in the hierarchy.

[Ducasse]

Its applicability is

applicabilityPreconditions

	^ {
		  (RBCondition withBlock: [
			   oldSelector numArgs < newSelector numArgs ifTrue: [
				   oldSelector numArgs + self newArgs size = newSelector numArgs
					   ifFalse: [
						   self refactoringError:
							   'You don''t have the necessary initializers to replace senders.' ] ].
			   true ]).
		  (RBCondition definesSelector: oldSelector in: class).
		  (RBCondition definesSelector: newSelector in: class) }
	"This is unclear that the targeting method should already be defined."

and

definesSelector: aSelector in: aClass
	^self new
		block: [aClass directlyDefinesMethod: aSelector]
		errorString: aClass printString , ' <1?:does not >define<1?s:> ' , aSelector printString

So replace Message Send should be replace self send.