Renamed the file name to record noisy experiments

Renamed solution_error_clop.xlsx to noisy_optimization.xlsx. In
addition, more experimental results are recorded in
noisy_optimization.xlsx.
Added a script to exhibit a potential future work

A possible factor that affect the performance of solvers for noisy
optimization is the population size. This script shows that ProJADE/eig
can be further improved with a large population size. Also, this
observation can explain excellent performance of SaDE in noisy
optimization.