Enhance cells in multiple column tables with CSS classes related to the fields they contain

Multigroups can be configured to render the fields in multiple column tables, in node edit form (multigroup settings screen) and node view (Display fields screen).

When multiple column tables format is selected, the cells could include CSS classes related to the fields they contain. This feature would provide more options for themers, and it could also be used to write jQuery selectors to target these cells for more advanced behaviors.