add a couple of missing @since groovydoc lines
GROOVY-7091: Cloning with AutoClone results in Null Pointer Exception
GROOVY-7085: Add DefaultGroovyMethods.size(Iterable)
GROOVY-7042 - Make sure doExtendTraits doesn't apply the fields helper twice

Conflicts:
	src/main/org/codehaus/groovy/transform/ASTTestTransformation.groovy