Adding an IDL_index column to be used as a 'name' thingy.
Added Megeath2012_Full to the code.
Updated the output file to conform to the new mated_ukvar.

I've added the "full Megeath table" in tablemate_script, and this guy rocks that. (I better commit tablemate_script!!)
And now I've added Megeath_Full to `tables`. This is important!

because then it gets included in UKvars_match(), which the mated_ukvar_1226_oneoff depends on!