Bump C++ dependency to C++17 standard. * benchmark: add a second output `csv` file with the rank for each solvers and models to show best solver. * Optimize all solver algorithms to improve performance: rewrite and generalize. * Improve the `best-cycle` algorithm: is no best solution was found for three complete optimization, solver restart to `bastert-cycle`. * Fix the initialization cycle behaviour. * Fix the random normalization behaviour. * Remove useless header (sparse-vector etc), dead code.