Bulk watch/unwatch issues from the context menu (#7159).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11339 e93f8b46-1217-0410-a6f0-8f06a7374b81
Adds a test for creating an issue with watchers.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11340 e93f8b46-1217-0410-a6f0-8f06a7374b81