Updated power patch to remove auto number<->string conversion

[Reuben Thomas <rrt@...>]

I've updated my patch at

http://lua-users.org/wiki/LuaPowerPatches

with a small fix for string concatentation.

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http://rrt.sc3d.org/ | impunity, n.  wealth (Bierce)