Separate solvers

[abelsiqueira]

With the creation of SolverBenchmark.jl, we can remove plot-related things from this package completely and only use SolverBenchmark.jl, remove the solvers and create specific packages for them, and have only:

• Tools: (folder auxiliary, linesearch, and trust-region);
• Structure: (folder stats, essentially ExecutionStats);
• Bmark: (folder bmark).

This should stay small. Then, we could change the name to something more descriptive (SolverTools.jl?).

So, for developing a new solver and creating dataframes with comparison: using SolverTools. For plotting or publishing these results: using SolverBenchmark.

What about the solvers? Should they have individual packages? Should they be bundled according to type. Should all "approved" solvers be in a special package? We could have

• JSOSolvers.jl: Competitive solvers, with benchmarks against other solvers (IPOPT, Optim), with PkgBenchmark checking regressions;
• JSOTextbookSolvers.jl: Simple solvers, decent implementation.

[abelsiqueira]

Done.

• SolverTools.jl
• JSOSolvers.jl
• We dropped JSOTextbookSolvers