Readline support

[Reuben Thomas <rrt@...>]

I notice that Sean Bolton has updated Mike Pall's patch
(http://luajit.org/patches/lua-5.2.0-advanced_readline.patch), and it
seems to be a superset of my readline "save history" patch
(http://lua-users.org/files/wiki_insecure/power_patches/5.2/lua-5.2.0-save_readline_history.patch)
plus my version of rlcompleter
(https://github.com/rrthomas/lua-rlcompleter).

Would anyone mind if I withdrew my patch and version of rlcompleter in
favour of this patch? I'd rather spend my effort where it's needed,
and this seems like unnecessary duplication to me.

-- 
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