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.
The entire framework repo (with the exception of system-generated files) has been amended to respect the 120c line-length limit. This is in preparation for the enforcement of this rule with PHP_CodeSniffer.
Fixes the handleAction function of GridFieldDeleteAction which wasn't differentiating between a 'deleterecord' action and an 'unlinkrelation' action.
Fixes http://open.silverstripe.org/ticket/7801