crediting sources in a Mural project

[dpocock]

It would be really useful to have some mechanisms for crediting sources.

This might involve several components:

• when editing each element of the sequence, a box where credits can be recorded (name of source, copyright, date, link, ...). Some items might have multiple credits.

• an extra area in the site meta-data for adding any other arbitrary credits (e.g. names of sponsors, reviewers, ...)

• an option to display the relevant credits when the content is viewed, on a page-by-page basis

• a popup box or summary page at the end where all the credits are listed

The popup box could be integrated with the button for scrolling suggested in #51, it can also be combined with credits for Mural developers.