Parallel evaluation
Added success rate
Reorder the functions to plot
Fixed a bug that xbest2 may not be assigned

Fixed a bug that the values of xbest2 and xbest3 may not be assigned
when a solver is resumed from a previous state. Specifically, when f is
evaluated in the previous state and the solutions were converged, then
the innerXbest will not be updated (assigned). This bug has been fixed
in this commit which get the exact value from the information stored in
the cell array innerState.
Added constraint handling

Also, the solvers are verified as resumable solvers.