Set up author data for the author template immediately, rather than waiting for the first the_post() call.

This removes the need to call the_post() and rewind_posts() in an author template to print information about the author.

props obenland.
fixes #14408.


git-svn-id: https://develop.svn.wordpress.org/trunk@25574 602fd350-edb4-49c9-b593-d223f7449a82
Inline documentation for `comment_form()` argument defaults missed in [25573].

See #25388.


git-svn-id: https://develop.svn.wordpress.org/trunk@25575 602fd350-edb4-49c9-b593-d223f7449a82