Slightly improved logic
Add support for relations more than one 'level' apart
Add unit tests
Fixing PostgreSQL support
Throw exception if attempting to sort on a has_many/many_many relation
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.
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.
1. Modified gridfield to use default colours
2. Added ability to show and hide the filter
3. Design changes to icons used
4. Gridfield template fixes: Took out broken mark-up from templates
(spans were being inserted inside spans), and adjusted styles. Added
extra class to template
5. Added "filter by ..." placeholder text to input fields
API CHANGE: Simplified state handling so that it's just a key store. Affectors are replaced with GridField_ActionProviders. API CHANGE: Removed GridField state manipulation actions instead opting for GridField_ActionProvider actions.
API CHANGE: Removed support for modifiers that add "body" rows, instead having core support for generating the body rows hardcoded into the GridField.
API CHANGE: Allow modification of columns across the whole GridField with the GridField_ColumnProvider interface.
API CHANGE: Renamed GridField_AlterAction to GridField_Action, and added actionName/args parameters, since it can be used for all actions (including batch actions and row actions)
API CHANGE: Removed GridFieldRow class.
