Cutadapt

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* add ``--discard`` option which makes cutadapt discard reads in which an adapter occurs

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* (more) correctly deal with multiple adapters: If a long adapter matches with lots of
errors, then this could lead to a a shorter adapter matching with few errors getting ignored.

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* fix huge memory usage (entire input file was unintentionally read into memory)

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* allow FASTQ input

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* initial release