Endline census data- rename preload variables

[Archi11Gupta]

We must rename these preload variables. We can add a prefix r_ so that we know these are preload variables. There are other Cen_ variables in this dataset and it might create a conflict. I am adding a list of all preload variables that don't have the prefix r_in them

Cen_fam_age1
Cen_fam_age2
Cen_fam_age3
Cen_fam_age4
Cen_fam_age5
Cen_fam_age6
Cen_fam_age7
Cen_fam_age8
Cen_fam_age9
Cen_fam_age10
Cen_fam_age11
Cen_fam_age12
Cen_fam_age13
Cen_fam_age14
Cen_fam_age15
Cen_fam_age16
Cen_fam_age17
Cen_fam_age18
Cen_fam_age19
Cen_fam_age20
Cen_fam_gender1
Cen_fam_gender2
Cen_fam_gender3
Cen_fam_gender4
Cen_fam_gender5
Cen_fam_gender6
Cen_fam_gender7
Cen_fam_gender8
Cen_fam_gender9
Cen_fam_gender10
Cen_fam_gender11
Cen_fam_gender12
Cen_fam_gender13
Cen_fam_gender14
Cen_fam_gender15
Cen_fam_gender16
Cen_fam_gender17
Cen_fam_gender18
Cen_fam_gender19
Cen_fam_gender20
Cen_female_above12
Cen_female_15to49
Cen_num_female_15to49
Cen_adults_hh_above12
Cen_num_adultsabove12
Cen_children_below12
Cen_num_childbelow12
Cen_num_childbelow5
Cen_num_malesabove15
Cen_malesabove15_list_preload
Cen_num_hhmembers
Cen_num_noncri

@AkitoKamei @mich1995 @avohra29 @jlowe-git

[AkitoKamei]

I think I added all, but let me know. I did this in "1_8_A_Endline_cleaning_v2.do" as adhoc solution since I did not want to touch Astha's code. @avohra29 (I think it make sense for you to resolve in your code)