Graphistry

Added
* Docs: [demos/demos_databases_apis/neptune/neptune_tutorial.ipynb](https://github.com/graphistry/pygraphistry/blob/master/demos/demos_databases_apis/neptune/neptune_tutorial.ipynb)

Changed
* Docs: Updated [demos/for_analysis.ipynb](https://github.com/graphistry/pygraphistry/blob/master/demos/for_analysis.ipynb) to `api=3`

Fixed
* Fix: Gremlin (Neptune) connector deduplicates nodes/edges

Added
* Feature: Gremlin connector (GraphSONSerializersV2d0)
* Feature: Cosmos connector
* Feature: Neptune connector
* Feature: Chained composition operators:
* `g.pipe((lambda g, a1, ...: g2), a1, ...)`
* `g.edges((lambda g, a1, ...: df), None, None, a1, ...)`
* `g.nodes((lambda g, a1, ...: df), None, a1, ...)`
* Feature: plotter::infer_labels: Guess node label names when not set, instead of defaulting to node_id. Runs during plots.
* Infra: Jupyter notebook: `cd docker && docker-compose build jupyter && docker-compose up jupyter`
* Docs: Neptune, Cosmos, chained composition

Changed
* Refactor: Split out PlotterBase, interface Plottable

Fixed
* Fix: Plotter has `hypergraph()`

Added
* Docs: security.md

Fixed

* Hypergraphs - detect and handle mismatching types across partitions

Changed

* Infra: Speedup testing containers via incrementalization and docker settings
* Infra: Update testing container base builds

Added

* Feature: Hypergraphs in dask, dask_cudf modes. Mixed nan support. (https://github.com/graphistry/pygraphistry/pull/225)
* Feature: Dask/dask_cuda frames can be passed in, which will be .computed(), memoized, and converted to arrow (https://github.com/graphistry/pygraphistry/pull/225)
* Infra: Test env var controls - WITH_LINT=1, WITH_TYPECHECK=1, WITH_BUILD=1 (https://github.com/graphistry/pygraphistry/pull/225)
* Docs: Inline hypergraph examples (https://github.com/graphistry/pygraphistry/pull/225)

Changed
* CI: Disable seccomp during test (docker perf) (https://github.com/graphistry/pygraphistry/pull/225)

Added

* Feature: cudf mode for hypergraph (https://github.com/graphistry/pygraphistry/pull/224)
* Feature: pandas mode for hypergraph uses all-vectorized operations (https://github.com/graphistry/pygraphistry/pull/224)
* Infra: Engine class for picking dataframe engine - pandas/cudf/dask/dask_cudf (https://github.com/graphistry/pygraphistry/pull/224)
* CI: mypy type checking (https://github.com/graphistry/pygraphistry/pull/222)
* CI: GPU test harness (https://github.com/graphistry/pygraphistry/pull/223)

Changed

* Hypergraph: Uses new pandas/cudf implementations (https://github.com/graphistry/pygraphistry/pull/224)

Added

* Infra: Issue templates for bugs and feature requests

Added

* Docs: Overhaul Sphinx docs - Update, clean all warnings, add to CI, reject commits that fail
* Docs: Setup.py (pypi) now includes full README.md
* Docs: Added ARCHITECTURE, CONTRIBUTE, and expanded DEVELOP
* Garden: DRY for CI + local dev via shared bin/ scripts
* Docker: Downgrade local dev 3.7 -> 3.6 to more quickly catch minimum version errors
* CI: Now tests building docs (fail on warnings), pypi wheels distro, and neo4j connector

Breaking 🔥

* Changes in setup.py extras_require: 'all' installs more