Correct the store of elites

The elite need to be saved only after the last generation.
Implement the sending of the training data into the PL

Lena image with 5% salt-and-pepper noise is sent as the training image.
The image size is 128x128.
Update population handling

Here the elite does not need to be evaluated in every generation.
Therefore, lambda individuals can be implemented in the PL.
Remove unnecessary function
Adjust parameters
Correct time output format
Add initialization for population initialization

The consequent runs could be influenced by the previous best fitness
value.
Reduce and reformat the listing of fitness values

The transfer (through UART) took a very long time. Now the fitness is
printed only after it really changes. The generation index is also
printed (for easier post-processing).