Disable automatic mailing to the group.

Most comments are not so essential for the whole team and plenty are private notes. It's recommended to disable those and enable by hand when a comment is important.
Possibility to open a new issue form after viewing another one.

While looking at an issue you no longer need to go back to the issue list for creating the next one.
Comment wont be mailed to team by default.

No more magic for deciding which comment is important or not.
Merge pull request #2524 from sourcerer-mike/4-0-stable

Improve usability and quit spamming