This commit makes some significant changes to the phpbb.confirm_box function
(namely, removing some duplicate code), and also manually adds most link
to the phpBB AJAX functions.
PHPBB3-10272
As well as adding the method, this commit also changes the previous commit
so that deleting a post from viewtopic uses this method, too. This commit
has also made some improvements to phpbb.alert and phpbb.confirm.
PHPBB3-10271
This commit adds the phpbb object (JavaScript), and alert and confirm box
methods. It also adds the first basic AJAX functionality, to deleting posts
in viewtopic.
PHPBB3-10270
