Orders the factor levels.
dic_order(x, dic, type)a variable (code or labelled) to get order for.
a name of the dictionary. Correspond a variable name in the
data_frame from get_eurostat(). Can be also data_frame from
get_eurostat_dic().
a type of the x. Could be code or label.
A numeric vector of orders.
Some variables, like classifications, have logical or conventional
ordering. Eurostat data tables are nor necessary ordered in this order.
The function dic_order() get the ordering from Eurostat classifications
dictionaries. The function label_eurostat() can also order factor levels
of labels with argument eu_order = TRUE.
Other helpers: 
cut_to_classes(),
eurotime2date(),
eurotime2num(),
harmonize_country_code(),
label_eurostat()