.sav files?
Automatically optimize EAs.
Revert ".sav files?"

This reverts commit fa49243ba6cb41ecfa7e2b7ba2ab63495d48f004.
Fix a lb > ub issue.
Automatically determine lb and ub.
Inverse robustness difference value.
Display the best parameter.
Modify .gitignore (*.sav -> *.asv)
Optimize NP parameter for DE/rand/1/eig.