Update 79Gen2 Twins & Trips

[wibeasley]

The 2012 & 2014 items about twins & trips are surprisingly full. For instance, this 2014 survey says there are 59 additional twins that haven't yet been added to the roster. This seems really high, doesn't it @mhunter1?

Here are the items:

        HerTwinsTripsAreListed = 50,
        HerTwinsAreMz = 52,
        HerTripsAreMz = 53,
        HerTwinsMistakenForEachOther = 54,
        HerTripsMistakenForEachOther = 55,

Here's an example variable. The others are under items 50 through 55 in data-public/metadata/tables-79/variable.csv.

T44833.00    [Q9-29J.01]                                    Survey Year: 2014
  PRIMARY VARIABLE

             ANY BIOLOGICAL TWINS/TRIPLETS LISTED? (MULT BIRTH 01)

(INTERVIEWER: FOR EACH PAIR OR GROUP OF CHILDREN WITH THE SAME BIRTHDATE BUT NOT
IDENTIFIED AS TWINS/TRIPLETS/ETC., ASK:)  Is it correct that (READ NAMES OF 
CHILDREN) are (twins/triplets/etc.)?  (DO NOT RE-REPORT TWINS/TRIPLETS ALREADY 
IDENTIFIED.)

    4500       0 NO (ADDITIONAL) TWINS/TRIPLETS/ETC. ON CHILD ROSTER
      59       1 ONE SET OF (ADDITIONAL) TWINS ON CHILD ROSTER
       1       2 ONE SET OF (ADDITIONAL) TRIPLETS ON CHILD ROSTER
       7       3 INCORRECT TWINS/TRIPLETS/ETC. IDENTIFIED ON CHILD ROSTER
  -------
    4567
 
Refusal(-1)            1
Don't Know(-2)         3
TOTAL =========>    4571   VALID SKIP(-4)    2500     NON-INTERVIEW(-5)    5615
 
Lead In: T44832.00[1:1]
Default Next Question: T44834.00