The first version of the euro2date
Error message if file does not exist on the server
Improve error check in get_eurostat_raw

Also reinstate author field to get_eurostat and _raw
Improved version of the euro2date

Now handles Y, Q and M dates. Others (are there?) are returned unmodified
The last argument for eurotime2date

Also documentition update and the url for an  author field in get_eurostat