[doc] typos
[enh] work on a more clever way of programming comma proxy list
[mod] simplify code
[enh] convert input to node object
[enh] do comma_proxy_list.append
[mod] change that to a TODO
[enh] implement comma_proxy_list.pop
[mod] DRY
[mod] reduce code size
[enh] implement comma_proxy_list.__delitem__
[mod] update TODO
[mod] proxify index method
[mod] same for __getitem__
[enh] implement comma_proxy_list.remove
[mod] todo done \o/