Smot

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* Improve internal documentation and include examples
* Fix dependency handling in setup
* Remove stub `smot stat` command

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* Export type annotations

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* Fix bugs in older Python versions caused by MyPy
* Drop support for Python 3.6 and prior versions - this is unfortunate, is MyPy worth it?

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* Add MyPy type annotations
* Migrate from Travis to GitHub Actions CI

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* Change the `--scale=r` parameter in `sample para` and `sample mono` to
represent `n^(1/r)` instead of `n^r`. With this parameterization, `r` ranges
from 1 to infinity and thus does not conflict with the `--proportion` term
(which ranges from 0 to 1). They do overlap at `--scale=1` and
`--proportion=1`, but these are equivalent, both sampling everything.

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* Setup smot module interface
* Add `color push` and `color pull` commands