Later: make default settings more sane

private: False
* If #653 gets done, notices are much more easier to lose.

tellOnJoin: False
* Many people are using bouncers or running their IRC clients on 24/7 up server, so in many cases joins don't tell anything on are people really present, so it's better to just wait for them to say something.
Merge pull request #655 from Mkaysi/patch-2

Later: make default settings more sane