MEP: info element in block elements

Attached is a proposal to allow info as a child of block container
elements, as well as lists and tables. It's done as per the MEP process
I outlined  here:

http://projectmallard.org/pipermail/mallard-list/2013-August/000168.html

I've copied the background and proposal into this email for convenience.

Comments please.

Background
----------
Mallard provides an info element that can be place at the beginning of a
page or section element and may contain any number of informational
elements to provide automatic linking, alternate titles, credits and
copyright information, and much more.

Sometimes it's useful to provide some of this information for a smaller
portion of a page. For example, you may wish to credit the programmer
who contributed a code block, or the illustrator who created an image.
You might also want to provide alternate titles, even without linking,
as these can be used by extensions such as UI Expanders.

Proposal
--------
This page proposes alloing the info element as an optional first element
in any block element that contains other block elements, as well as any
block elements with structured content. As of Mallard 1.0, that includes
media, comment, example, figure, listing, note, quote, synopsis, list,
steps, terms, tree, and table.

As with the existing info element, there are no processing expectations
associated with the info element used on block elements. Certain
informational elements may introduce processing expectations of their
own. In Mallard 1.0, the only informational elements that normatively
affect page processing are related to linking. This page does not
propose adding block elements to automatic linking (although this
proposal would be a prerequisite for doing so).

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