TOC toggle fix, CSS fast follows, Diff view "timeline" drawer fix

- properly toggles the TOC at small browser widths
- adds icon support for IE7
- makes fast follow adjustments to the landing page styles
- Begins diff view CSS improvements
- Print styles for SxS
- improve sidebar media-query support for all resolutions
- Fixes broken "timeline" tab in diff view
- Opens external FR notice link in SxS in a new tab