improve some class comments
remove useless return in __init__()
comment
move old list test from broken into list.pyx
fix test
move old list test from broken into tests/compile/

--HG--
rename : tests/broken/builtinlist.pyx => tests/compile/builtinlist.pyx
extra : amend_source : 9d1f1806562a676bb13d2fe5472d5a9261fb3b18
reenable some tests
fix T600: lookup of iterables in genexpr must use outer scope