Speakers field should be more intelligent with what to do with input

Patch to change description added

I think for now, adding this description is good, but would like to continue this discussion in this issue.

Specifically, because of the variety of registration cases camps and conferences have (many speakers are not users or registered yet), we should allow for a username OR a first and last name. If its a username, add a link to the user's account (basically a user ref), and if its a name, just print the first/last name.

Because user reference fields just store UIDs, the current system cannot be adapted to work with what I propose above. We'd have to make it a new field type and add a view handler. Not simple. But I've heard this request many, many times. and I think its worth pursuing.

Description added in this commit:
http://drupalcode.org/project/cod_support.git/commit/0e4f38d

But we should still discuss how to make this field behave nicer.