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Reduces detaching in HuffdicDecompressor::unpack

Carl Schwan requested to merge work/carl/detaching-unpack into master

Use .at instead of operator[] to avoid detaching

Before (using polish dictionary from BUG 475975 as input):

RESULT : TextTest::benchmarkRead(): 21,672 msecs per iteration (total: 86,688, iterations: 4)

After:

RESULT : TextTest::benchmarkRead(): 4,190.7 msecs per iteration (total: 16,763, iterations: 4)

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