Move OpenCV to an optional dependency #4
Merged
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Enables a "slim" installation of the package by making OpenCV an optional dependency. Users can install OpenCV with the new "full" variant of the package to get support for model fitting. The default installation will only support forecasting from an existing model. Since this latter scenario is the most common use case for popcast and requires a substantially smaller footprint on disk, this default is what we'll want for environments like the Nextstrain Docker image.