Fixed deprecated render calls in Mailer.
Adds a deprecation warning to Mailer.deliver_*.
replace Mailer deliver syntax to Rails3 style
Changes RedMine to Redmine in copyright notices.
Copyright update.
move unit mailer test last_email method to the bottom and change to private
add missing fixture to test/unit/mailer_test.rb
Code cleanup, reuse the visible scope.
Do not trigger model validations when rebuilding the nested set (#10829).
