Genetools

* Many new stats, plotting, and helper functions. See PRs [24](https://github.com/maximz/genetools/pull/24) and [#73](https://github.com/maximz/genetools/pull/73).

* Two new functions to customize tick labels on any existing plot:
* `wrap_tick_labels`: add text wrapping
* `add_sample_size_to_labels`: add group sample sizes with a `(n=N)` suffix
* Make writing PDF figures a deterministic process and make the PDF text editable.
* Scatterplot improvements:
- Adjust default marker shape and size to work better for most plots.
- Adjust HueValueStyle so that an explicit marker size is not specified there, only a marker size scaling factor. The scatterplot itself is responsible for defining the base marker size, while the palette of HueValueStyles should be drawable at any marker size.
- Change legends so that only one marker is drawn to indicate a group's style.

* Improve scatter plots and stacked bar plots.
* Introduce `HueValueStyle` for granular styling of each hue.

* Centered log ratio (CLR) normalization for Cite-seq protein data.

* Pandas helpers for easier normalization

* Far faster implementation of `stats.coclustering`
* Introducing `helpers.make_slurm_command`
* Global submodule import (no longer need to import submodules individually)