Ctf consensus: performance improvement. Reduce steps number

[albertmena]

Reduce the number of Steps, making it generate a step for the set of new CTFs. This way the loops would be inside the Step and the Steps-tree would gain performance and sense. The idea is that if there are 5 new CTFs, a step is made to process them, not 5. In this way, if it is not in streaming, only one Step will be generated, because all the CTFs will be available from the beginning.