Add ability to have 'row titles' column.

Hi,

Attached is a little patch that adds the ability to add a 'row titles' column to the 'Multiple Fields as Table' group formatter, into the left most column of the form table and display table for the node.

This is something that I really needed for a few projects and this module came soo close that with this tiny addition in functionality it does everything I need, so thank you very much.

In the config form for 'Multiple Fields as Table' field group formatter, there is a new box to enter the row titles as comma separated values. If nothing is entered the column does not render, if it does, it takes the first value as the column header and the rest as row titles. If the first value is -none- then it leaves the header blank.

Patch is against 7.x-1.x branch in git.