fixes #1717

Doc fix

Remove not used uses

This reverts commit 90c2f109.

Actualize phpunit usage approach

Small fixes for the sake of consistency

Using constants instead of literals in Behavior docs

Mail events before/after

Removed redundant code in detachBehaviors()

After ensureBehaviors() call $this->_behaviors is an array already.
And since detachBehavior() unsets elements in $this->_behaviors, $this->_behaviors turns out to be an empty array after all iterations.

improved database panel in debug module