Added PGSS data on gender roles in txt
Added earnings data in SPSS format
Roxygenizations
Moved aux data to 'exdata'

Copy of gender_roles in 'data' and 'exdata'
Trimmed data on gender roles

Less variables and only two years
Renamed earnings data to earnings.sav
Earnings data renamed to just 'earnings.sav'
Added package :: in calls in data source files
Added :: in .R data files
Dropped mbtools from Suggested
Roxygenizations after update

Roxygenizations after 'roxygen2' was updated to version 4.0.1
Dropped data() calls from examples

As all data is LazyLoaded.
Fixes in SMI documentation.
Plus roxygenizations.
Added IBE data

unfinished doc
Questions in IBE data identified with labels

Sociometric questions in IBE data are now identified with textual labels
not question numbers.
Merge branch 'dev' into work
Fixes to IBE121 doc