test implement balanced field#203

AmielMetier wants to merge 3 commits intomaincontrol-toolbox/OptimalControlProblems.jl:mainfrom

202-general-new-problem-the-van-der-pol-oscillatorcontrol-toolbox/OptimalControlProblems.jl:202-general-new-problem-the-van-der-pol-oscillatorCopy head branch name to clipboard