Dwave-networkx

Fixes
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* Remove deprecated calls to translator functions
* Fixes bad midpoint calculation in `draw_qubit_graph`
* Fix QUBO generation for TSP
* Misc doc fixes


New Features
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* Add ability to plot overlapped embeddigs

New Features
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* `fragmented_edges` function
* A midpoint for the color range can be provided for `draw_qubit_graph`

Fixes
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* `draw_yield` correctly assigns rows and columns

Features
--------
* `linear_to_chimera` and `chimera_to_linear` functions
* More explicit relabelled methods in `pegasus_coordinates` and `chimera_coordinates` classes

Fixes
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* Elimination order functions now handle self loops
* Support NetworkX 2.4 changes

Changes
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* `chimera_coordinates.int`, `chimera_coordinates.tuple` (and derived) are deprecated and will be removed in 0.9.x
* `pegasus_coordinates.int`, `pegasus_coordinates.tuple` (and derived) are deprecated and will be removed in 0.9.x

New Features
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* Better colour bar handling by the `draw_qubit_graph` function

Changes
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* pegasus "nice" coordinates changed from `(x, y, u, k, t)` to `(t, x, y, u, k)`

New Features
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* `crosses` kwarg in `draw_pegasus` function
* `draw_chimera_yield` function
* In `draw_qubit_graph`, color bar is toggled based on biases provided
* `min_vertex_color` function (alias of `min_vertex_coloring`)
* `min_vertex_color_qubo` function
* `vertex_color` function
* `vertex_color_qubo` function
* `traveling_salesperson` function (alias of `traveling_salesman`)
* Add `start` kwarg to `traveling_salesperson` function

Fixes
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* `traveling_salesperson` now correctly treats the graph as undirected

New Features
------------
* A new nice coordinate system for Pegasus graphs