further improved stream api for results

move to new moptipy version

move to new moptipy

attempt to improve instance generation

move to new pycommons and moptipy with generator-based csv api

hopefully some improvements in how instance hardness and errors are w…

…eighted

using new moptipy version and modified experiment

several improvements and dependency version stepping

move to new moptipy and pycommons version

fixed typo in lower bound tour length for cn11, also added optimal tour