Add support for package preferences

[MilesCranmerBot]

Fixes #89

Package entries in juliapkg.json may now include an optional "preferences" object, which is written to the [preferences.<pkg> table of the generated Project.toml (read natively by Julia's Pkg, as used by Preferences.jl). Preferences from multiple juliapkg.json files are merged by key; conflicting values for the same key raise an error.

{"packages": {"SymbolicRegression": {"uuid": "8254be44-1295-4e6a-a16d-46603ac705cb", "version": "1", "preferences": {"precompile_float64": false}}}}

[cjdoris]

I like this! There's quite a lot of new text in the readme about this (not in keeping with the rest of the docs). I suggest removing it all and instead please add a preferences=None arg to the add function, and document that in the readme.

Also META_VERSION needs to be bumped.

[MilesCranmer]

@MilesCranmerBot could you please address the above?

[MilesCranmerBot]

Done in 6db238c:

• Trimmed the README back to one line under the juliapkg.json section and documented preferences on the add() signature instead.
• add() now takes an explicit preferences=None arg.
• Bumped META_VERSION 6 → 7.

Tests: 123 passed locally (pre-existing test_editable_setuptools env failure is unrelated).

[cjdoris]

Thanks!

[cjdoris]

Released in v0.1.25.