Remove deprecations included in 0.10 release

[huonw]

This includes simplifying BlogCatalog3.load because we no longer need to support load_dataset_BlogCatalog3.

See: #959

[codeclimate]

Code Climate has analyzed commit 96d6bcb and detected 1 issue on this pull request.

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Category	Count
Security	1

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[codecov-io]

Codecov Report

Merging #969 into develop will decrease coverage by <.1%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           develop    #969     +/-   ##
=========================================
- Coverage     84.4%   84.4%   -<.1%     
=========================================
  Files           58      53      -5     
  Lines         4945    5168    +223     
=========================================
+ Hits          4176    4364    +188     
- Misses         769     804     +35

Impacted Files	Coverage Δ
stellargraph/core/graph.py	98.5% <ø> (-0.1%)	⬇️
stellargraph/data/loader.py	42.1% <ø> (+4.6%)	⬆️
stellargraph/datasets/datasets.py	68.9% <0%> (+1.7%)	⬆️
stellargraph/ensemble.py	85.5% <0%> (ø)
stellargraph/calibration.py	79.9% <0%> (ø)

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[kieranricardo]

There's a couple of deprecated arguments still here. (+ graph and node_type_name above that github wont let me suggest changes for)

Suggested change

	Deprecated, use :meth:`from_networkx`.
	edge_type_name:
	Deprecated, use :meth:`from_networkx`.

[huonw]

I had carefully left these ones here despite removing the adjacent edge_weight_label because these arguments are not properly deprecated: they don't trigger a runtime warning yet. I think it's important that we use a runtime warning to prompt people to move because:

• user with existing code won't re-read the docs, and
• they may not realise that a breaking change listed in the CHANGELOG affects their code (as in, they may not remember all the details about their code)

These arguments don't trigger a runtime warning yet because "FIXME(#717): this should have a deprecation warning, once the tests and examples have stopped using it" on line 253/241 below.

[kieranricardo]

cool that makes sense; everything looks good then

[kieranricardo]

Suggested change

	node_features:
	Deprecated, use :meth:`from_networkx`.

[kieranricardo]

👍