get prev/next topic are exactly the same function

Signed-off-by: emanuele <emanuele45@gmail.com>
Oooops...

Signed-off-by: emanuele <emanuele45@gmail.com>
Let the name be topicPointer()

Signed-off-by: Norv <a.w.norv@gmail.com>
Document the topicPointer() function.

Signed-off-by: Norv <a.w.norv@gmail.com>
Rename to nextTopic() and previousTopic()
Saves some bytes or it's more decent to the eye (pick your reason)

Signed-off-by: Norv <a.w.norv@gmail.com>
Merge pull request #167 from norv/mmm_topics

Mmm topics (not my name!)