recode_batch: apply many recodings at once with vector of 'where'...
In mabafaba/composr: Compose new variables - horizontal recoding operations

apply many recodings at once with vector of 'where' conditions

1	recode_batch(df, tos, wheres, targets = NULL, questionnaire = NULL)

`df`	a data frame or an ongoing recoding
`tos`	a vector of "to" values
`wheres`	a vector of "where" conditions; R code as strings (evaluated in namespace of the data)
`targets`	vector of target variables to create as characters. each change triggers a new_recoding(). if left empty, recodes to taret specified in new_recoding().
`return`	the ongoing recoding from after the last 'where' recoding. return to regular data frame with all new recodings visible with end_recoding()