- Add new class .dashboard_widget to apply necessary styles
- Remove obsolete plugin JS to cycle odd/even classes
Note: I have no idea why the diff for linktrimmer is huge. Might
have been encoded utf-8 before? Now it's iso-8859-1.
References s9y/Serendipity#297
Unfortunately, I misunderstood the example code for switching the
backend nav section, so some plugin were linked to twice in the
backend nav. This should fix it.