Split Scanorama into two methods, correcting misleading score

[schafferde]

Describe your changes

I split Scanorama into embedding (integrate) and count-correction (correct) modes, instead of running both together. This makes clear what the reported score(s) are describing, as raised in #80 . Also, this corrects the misleadingly low score that the combined method receives (0.1761). The scores for each component are in line with their scores from v1, where the modes were separated. Locally, I computed the two scores to be (without scaling) 0.5220 for integrate and 0.3051 for correct, but there may be minor differences in my computation.

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