Default to using multi-threading 🚀 #19
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To increase performance with the default settings, default to using multi-threading, specifically one
thread per CPU. The user must explicitly opt out if they want
single-threaded behavior, the previous default.
This indirectly solves a different issue: the only way to automatically
peg the number of threads to the number of CPU's was to set
--worker 0 --threads 0even though theworkerargument had beendeprecated.
Fixes #18