Add list of commonly-used CSS selectors to add form

Making title a little clearer

Now that 2.x is working, I'm moving all 1.x issues there.

I'm thinking this can be done entirely in JavaScript, hiding the textarea and adding a select with various options which would populate the hidden textarea, and an "other" option which would show the textarea again. For selectors, I'm no longer thinking it's worth looking up block or view IDs, as I doubt that's a common use case. I think these selectors probably cover most needs:

• all headers (h1, h2, h3, h4, h5, h6)
• h1
• h2
• h3
• standard text (p, div)
• everything (body)

This is committed in dev, if anyone wants to try it. Still needs porting to D6 version.

Included in new 7.x-1.2 release.

Still needs porting to 6.x branch.

This is done in 7.x-2.x, so we can just skip it in 7.x-1.x.