Allows searching for multiple scales to be configurable #176
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In running a small program that was searching for a label in a small, constrained region I was a bit surprised that it could take 5 seconds to find a match. My first thought was io (hence the other pr). Turns out, the multiple scale search is the vast majority of the time. In usecases where the relative size of the needle will be fixed, being able to disable this greatly increases the speed of the search (taking it down to a second or less).
I haven't added tests yet and I'm sure there's extra doc updating that needs to happen. Wanted to run this by you first to see if it's on track.