Revert r36893 and friends ("Tweak 'previewnote' a bit: Add a handy link to the edit...

Revert r36893 and friends ("Tweak 'previewnote' a bit: Add a handy link to the edit box. Especially useful on long pages.")
* Mixes control link into general text, will be missing where it's customized
* Mixes control link into text with a specific style, which is bad form
* Behavior should be different when edit box is above the preview, but here it's hardcoded