Blurrer.RdConvert self to a list.
Blurrer
Apply blur to a vector of values
'Bluring' refers to aggregation of data e.g. converting city to country, or post code to IMD. The level of blurring is defined by the list given at initialization which maps key to value e.g. list(London = "England", Paris = "France").
blurList of aggregations to be applied. Create new Blurrer object