Change u₀ to u0

[TorkelE]

Related to https://github.com/SciML/ReactionNetworkImporters.jl/issues/104

This is highly breaking though.

[isaacsas]

If we want to add this there needs to be an overload so the old notation works and returns u0 too. Then this isn’t breaking anything.

[TorkelE]

Is that possible (without simultaneously supporting both fields)? I am only familiar with overloads for functions, so would be unsure how to do this.

[isaacsas]

See getproperty and setproperty.

[TorkelE]

But both u₀ and u0 which are given to these would have the same type (Symbol). Or you mean create new version of these functions on ParsedReactionNetwork that first check if the input is u₀, and if so calls it again with input u0?

[codecov[bot]]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (039f31e) 83.76% compared to head (9f42497) 83.00%.

Files	Patch %	Lines
src/ReactionNetworkImporters.jl	60.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #107 +/- ## ========================================== - Coverage 83.76% 83.00% -0.76% ========================================== Files 4 4 Lines 351 359 +8 ========================================== + Hits 294 298 +4 - Misses 57 61 +4 ```

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[TorkelE]

Updated. These overloads added:

# Ensures that `prnbng.u₀` works.
function Base.getproperty(prnbng::ParsedReactionNetwork, name::Symbol)
    if name === :u₀
        return getfield(prnbng, :u0)
    else
        return getfield(prnbng, name)
    end
end

# Ensures that `prnbng.u₀ = ...` works.
function Base.setproperty!(prnbng::ParsedReactionNetwork, name::Symbol, x)
    if name === :u₀
        return setfield!(prnbng, :u0, x)
    else
        return setfield!(prnbng, name, x)
    end
end

Given that parsed reaction networks are immutable, I don;t think the other one is needed though?

I have also added a couple of tests in the tests file to check that (for some loaded network)

@test isequal(prnbng.u0, prnbng.u₀)

[TorkelE]

This one should be ready now.