The idea of this forum (or the forum it's based on, stackoverflow, is that people edit their questions and answers, in theory 1 person should never have more than 1 answer in a certain thread and all questions and answers should be fully readable on their own without needing to see other replies. Sometimes a question gets amended and answers get updated, sometimes completely new questions arise and new threads are made. In practise this does not always work here (stackoverflow is a lot better at this because people there have more experience with this format) but it is something we want to move towards.
Ie, in short, we want to move to the following system:
Each question has one (possibly) accepted answer that answers the question.
If extra information is needed, people should not comment but edit their original question. Ditto goes for answers.