Clarify consensus -@N speed expectations.#2141
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Like many commands, this is currently file format decoding only and the consensus command can be dominated by the main worker thread. The most extreme case of calling a simple consensus on an archive-mode CRAM still only gained a 2 fold speed up, so more than 1 decode thread isn't necessary. Fix samtools#2134
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Like many commands, this is currently file format decoding only and the consensus command can be dominated by the main worker thread. The most extreme case of calling a simple consensus on an archive-mode CRAM still only gained a 2 fold speed up, so more than 1 decode thread isn't necessary.
Fix #2134