EDIT: Done 2014-10-15

I've carried out most of the changes, and implemented some changes to rendering. These remain to be done:

• Check for internal links which have only their mol: id as link text in editorial notes, and expand them.
• Add any useful Schematron rules to force e.g. the use of @source when @evidence="external".

We're also discussing the fact that footnote numbers in the text look like "supplied" text because they're rendered using square brackets; I propose to change these to small buttons as in Mariage, and see if that's preferred by the team.