Close metafile so isolated process cannot write to it - #1

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ronalchn wants to merge 1 commit into

bblackham:masterfrom

NZOI:isolate.close.metafile

Commits on Nov 20, 2013

close metafile to prevent box_inside writing false data to it - see https://github.com/ronalchn/isolate-cheater
ronalchn
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