IndexedFastaFile.setThreads

Enable multithreaded decompression of this FA/FQ Reading fn body of bgzf_mt, this actually ADDS threads (rather than setting) but we'll retain name for consistency with setCacheSize NB: IN A REAL-WORLD TEST (swiftover) CALLING setThreads(1) doubled runtime(???)

struct IndexedFastaFile
deprecated
void
setThreads
()

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