Let DE/mean/2/bin record more information

DE/mean/2/bin can now record fmin, fmean, fstd, xmin, xmean, and xstd
during evolution.
Added project path before executing scripts

Let testspecificrun.m add project path before executing the script.
Redefine maximal function evaluations

Redefine maximal function evaluations to show different performance
between the candidate solvers.
Reduced population size in two solvers

The dimension factor parameters are reduced to improve the performance
of two solvers: DE/mean/2/bin and SDE/mean/2/bin.