Applet: possibility to cleanup transient applets
Even if an applet is marked as transient (for instance if somebody called setDestroyed, or if its parent is already transient. like in the bug report) it should be possible to destroy it as well, so if the corona is mutable, call cleanupoanddelete anyways (applet and containment immutability will always be systemimmutable when they are transient)
Edited by Marco Martin