Summary

Adds ys_extend() to extend a spec object with additional columns with any external yaml file; adds extend_file field in SETUP__: to identify a single file which can be automatically called upon for extension #112, #113.
ys_add_factors() refactored to only add factors for available columns #88, #91.
ys_add_factors() restores tidyselect semantics when specifying a subset of columns for adding factors #109, #110.
Add ys_table() to render the spec in TeX table code to be included in a report appendix #98, #104.
ys_select() returns an empty spec object when nothing is selected

100, #101.
Add ys_prune() to select any data columns that appear in the spec as well as other optional columns #87, #97. #99.
Add ys_recode() to convert a vector of data set column names to short version, optionally adding unit #86, #114.
ys_load() will now detect if values / decode are mis-coded as a list of lists; all items in values and decode must be atomic

106, #108.
ys_load() will issue more informative error message when short contains too many characters #102, 105.
ys_document() now accepts sponsor and projectnumber arguments which get passed through to the rendered define document #90, #92.

metrumresearchgroup / yspec