Floatify pi in PureJuMP models

[MaxenceGollier]

closes #438.

all the π are floatified:

gollmaxe@kappa.gerad.lan:~/OptimizationProblems.jl (1004)>grep -r "π" ./src/PureJuMP
./src/PureJuMP/hs9.jl:  @objective(nlp, Min, sin(π * x[1] / 12) * cos(π * x[2] / 16))
./src/PureJuMP/polygon1.jl:  @variable(nlp, 0 <= θ[1:N] <= 2π, start = 0)
./src/PureJuMP/polygon2.jl:  @constraint(nlp, sum(α) == 2π)
./src/PureJuMP/elec.jl:  θ0 = 2π .* range0
./src/PureJuMP/elec.jl:  ϕ0 = π .* range0
./src/PureJuMP/polygon.jl:  @variable(nlp, 0 <= θ[i = 1:N] <= π, start = i * π / (N - 1) - π / (N - 1))
./src/PureJuMP/polygon.jl:  @constraint(nlp, θ[N] == π)
./src/PureJuMP/robotarm.jl:  lvar = [zeros(n); -π * ones(n); zeros(n); -Inf * ones(6n); 0]
./src/PureJuMP/robotarm.jl:  uvar = [L * ones(n); π * ones(n); 2π * ones(n); Inf * ones(6n); Inf]
./src/PureJuMP/robotarm.jl:  lvar[2n] = uvar[2n] = 2 * π / 3
./src/PureJuMP/robotarm.jl:  lvar[2n + 1] = uvar[2n + 1] = lvar[3n] = uvar[3n] = π / 4
./src/PureJuMP/robotarm.jl:  θ0 = [2π / 3 * (t / n)^2 for t = 1:n]
./src/PureJuMP/robotarm.jl:  x0 = [L * ones(n); θ0; π * ones(n) / 4; zeros(6n); tf0]

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[github-actions]

Package name	latest	stable
AdaptiveRegularization
Envelopt
ExpressionTreeForge
JSOSuite
NCL
PartiallySeparableNLPModels
PartiallySeparableSolvers
RegularizedOptimization

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.32%. Comparing base (2ada450) to head (ded36d7).
⚠️ Report is 67 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #439      +/-   ##
==========================================
- Coverage   99.80%   99.32%   -0.48%     
==========================================
  Files        1084     1139      +55     
  Lines       12319    13548    +1229     
==========================================
+ Hits        12295    13457    +1162     
- Misses         24       91      +67     

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[odow]

You shouldn’t need this. Just update to the latest version

[MaxenceGollier]

@odow, the current compat entry is JuMP = "^1.15", isn't this safer than to make the large update to JuMP = "1.32.1" ?

[odow]

You can leave as is. You don’t need to change anything in this package.

The only broken version is v1.32.0, which is replaced by v1.32.1. Anyone still using v1.15 or v1.19 etc is okay.

[MaxenceGollier]

Ah, ok I didn't understand that, thank you.