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Remove some suppressed warnings which are not needed anymore, and clean up one which makes it more obvious why it is ok.

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Add missing alias from tink::cc to tink.

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NOKEYCHECK=True
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NOKEYCHECK=True
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Update HOWTO so that the variables are correctly named in the example code on reading and writing keysets.

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cc: Fix warning: implicit conversion loses integer precision: 'unsigned long' to 'int' [-Wshorten-64-to-32]
    ciphertext_destination->BackUp(next_result.ValueOrDie() - header.size());

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