get_data: Get data from Statistics Netherlands (CBS)
Description
Retrieves data from a table of Statistics Netherlands. A list of tables
can be retrieved with get_table_list.
Optionaly the data can be filtered on category values.
The filter is specified with <column_name> = <values> in which <values> is a character vector.
Rows with values that are not part of the character vector are not returned. Note that the values
have to be raw (un-recoded) values.