Add long versions of structures

[wfmackey]

Currently wide, eg:

library(strayr)
#> Loading required package: absmapsdata
anzsco
#> # A tibble: 1,180 x 11
#>    anzsco_major_code anzsco_major anzsco_submajor_… anzsco_submajor             
#>    <chr>             <chr>        <chr>             <chr>                       
#>  1 1                 Managers     10                Managers, nfd               
#>  2 1                 Managers     11                Chief Executives, General M…
#>  3 1                 Managers     11                Chief Executives, General M…
#>  4 1                 Managers     11                Chief Executives, General M…
#>  5 1                 Managers     11                Chief Executives, General M…
#>  6 1                 Managers     11                Chief Executives, General M…
#>  7 1                 Managers     11                Chief Executives, General M…
#>  8 1                 Managers     11                Chief Executives, General M…
#>  9 1                 Managers     11                Chief Executives, General M…
#> 10 1                 Managers     12                Farmers and Farm Managers   
#> # … with 1,170 more rows, and 7 more variables: anzsco_minor_code <chr>,
#> #   anzsco_minor <chr>, anzsco_unit_code <chr>, anzsco_unit <chr>,
#> #   anzsco_occupation_code <chr>, anzsco_occupation <chr>, skill_level <chr>

But there are use-cases for having this structure in long-form, as suggested by @daviddiviny .