Initial progressive output commit
Moved final outputprog class in a new directory

The outputprog class is now in a different directory, to be cleaner.
At this point, the outputprog class outputs a tab-separated file and
the gnuplot script for reading it, every line begins with the number of
traces and the N next columns represent the maximum value for the
Pearson coefficient of the N-th key.
Adapted input class for dpacalc_prog
First working prototype of dpacalc_prog

dpacalc_prog now executes and outputs as described in commit edcf15ac.
It has to be called with -t option specifying how many traces
it has to add at every round.
Filter functions are commented out and will be implemented later.