Issue #33 : Participant bio popover for "other" participants

[bcholmes]

Make the following changes:

• fetch the participant info via a Rest/JSON endpoint, rather than an XML interface
• tweak the code that manages the popover (instances of this.this.X were making my eyes bleed)
• improve some basic name handling (create a PersonName from a database record; render a PersonName as an array, ready to be rendered to JSON).

[LVerhulst4321]

Thank you! I'll make sure to examine this and hopefully learn from it so I can do this myself one day.

[lostcarpark]

The new code looks very tidy.
However, I have a slight concern that there's a lot of code added, but very little taken away. Does the JS for the old method still need to be on the form? Could the old code be stripped out of SubmitAdminParticipants.php?
I don't like leaving dead code in a project.

[lostcarpark]

One other small point. The bio pops up on the left edge of the participant drop-down. This puts it at the left edge of the page, which I find can be a little hard to read. Just wondering what you'd think of attaching the pop-up to the "show bio" button instead of the drop-down?

[LVerhulst4321]

James, the old code for fetch_participant is still being referenced by a few other spots in the code, so it cannot be stripped out at this time. Once the other spots are updated (which isn't a priority), then the old code can be removed.

Moving the pop-up is fine. It is a little hard to read over there.