tection of columns to merge</strong>.
 The automatic detection process starts by first identifying the key of each table, i.e. a set of variables identifying the entries in the table. This process is optimised for common formats of country data.
 The function will then try to match key columns across tables based on their values.
 Columns containing country names and time information are identified and are processed to take into account different nomenclatures and time formats.
 This automatic process works