Fix unit tests for `hs61`

[tmigot]

Since PR #69 , the JuMP models have an ADNLPModels translation, and we check the compatibility in the unit tests using NLPModelsJuMP.jl.
There is an issue with hs61 (see runtests.jl L16) because MathOptNLPModel is not working in this situation see #84 in NLPModelsJuMP.jl.

[dpo]

what's the issue exactly? I don't see @NLconstraint in hs61.

[tmigot]

The issue is that NLPModesJuMP.jl doesn't handle quadratic constraints specified with @constraints right now.

[tmigot]

Fixing Issue 50 in NLPModelsJuMP.jl would solve this issue.

[amontoison]

I can work on the support OF quadratic constraints in NLPModelsJuMP.jl if we agree on the storage for them.