Remove title attributes from author archive link functions, and allow removing them from author website links

[sabernhardt]

Option 2:

• Removes 'Posts by %s' title attributes from get_the_author_posts_link(), the_author_posts_link() and wp_list_authors().
• Creates a new $use_title_attr parameter for website links in get_the_author_link() and the_author_link().

By default, this would keep a distinction between links from get_the_author_link() functions and the post archive links, if they are on the same page.

Like option 1, it would also remove Core's 'Posts by %s' string, which at least 18 plugins and one recently unlisted theme have used.

Trac 62835

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