ENHANCEMENT Moved all Javascript containedin install.php and config-form.html to install.js, and using jQuery to simplify logic
ENHANCEMENT Allow installer to attach custom form fields based on the install driver (as defined in _register_database.php)
git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/branches/2.4@101054 467b73ca-7a2a-4603-9d3b-597d59a354a9
