Test for method inheritance over wrapped subclasses
Fixes #546
Uncommenting other method inheritance tests.
Fixes #544
DRY propagateMethodChange
st.initClass call moved to st.removeMethod
initClass refactoring, no need for installSuperclass
Refactoring inheritedMethods to be copySuperclass-local.
Merge branch 'gh-546' of https://github.com/herby/amber into herby-gh-546

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Merge branch 'gh-544' of https://github.com/herby/amber into herby-gh-544

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