There's a test (CompletenessTest) that interrogates the API and lists methods we've not implemented yet.
I'm gonna raise separate issues for each thing that needs implementing which will make it easier to split the work.

These are theTopics methods that need to be implemented.

• flickr.groups.discuss.topics.add
• flickr.groups.discuss.topics.getInfo
• flickr.groups.discuss.topics.getList