In what follows, we will reply to the critical comments one by one in the order that seemed most natural to us, given the topics covered. Apart from the references section towards the end, our replies are conceived as pieces each of which can be read independently from any of the others (but not, of course, independently from the comments it responds to). We hope to have done justice to the critical points made by our commentators and to have come (...) up with viable answers to the various challenges they raise. (shrink)