[bug 891851] Ability to edit question details

Note: It is currently possible for a question to have multiple products and multiple topics (in theory). In practice, this is not something that really happens. There are exactly 14 questions that have two products assigned to them and there are no questions with multiple topics. I'm not really sure how those 14 popped up because in the current AAQ flow there is no way to submit a question with two products (at least not that I am aware of). So I have assumed for the purposes of this that a question will only have one product and one topic otherwise this whole thing gets very messy.

Side Note: We should probably change the model for questions to only allow one product and one topic. 

r?