Fix notes template & add support for multiple elements with same data-fragment index

1. Resolves an issue where the first label (e.g., first bullet or first number) of a list would wrap to the right side of the window and be hidden under the floating clock element. (So a UL would end up with the first item apparently missing its bullet, etc.) Adding clear:left to the CSS for the notes DIV fixes this.

2. It's nice to be able to specify the same data-fragment-index for several elements and have them all appear at once rather than one at a time. Altered next/previousFragment() to check all fragments rather than just the first/last.