Cleanup of framework's use of @package and @subpackage labels and additional of labels for classes missing packages.
Moved all GridField related components to the one name.
Countless spelling fixes, grammar for other comments.
Link ClassName references in file headers.
GridField uses createTag() which is marked for deprecation, rather
than have it used as the cornerstone of generating FormField templates,
use it as a helper in case fields generate HTML tags from PHP.
