Labeling output files

[cruizgo]

When one runs a config file an output file is produced. This file contains, among others, the final graph and the values for 2 loss functions. The first value is the one for which the whole graph has been optimized, but it's not indicated! One needs to check the original config file but if this is modified the track gets lost.

The output file should explicitly say which loss function correspond to each value.