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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However, some compilers will issue warnings for it.

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Update documentation in some of the KeyTemplates to use keysetHandle.getPrimitive instead of the factories.

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Hybrid encryption Private and Public key managers

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We'll add support later.

NOKEYCHECK

NOKEYCHECK=True
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Also rename format to cryptofmt.

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buildifier -v --lint=fix

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The signature in the test vector and the signature that is generated
must be equal.

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