The current 'export_csv_names' is very basic. Inspired by the extension
'ExportCSVNames' I have update this functionality a little bit further.
So complex data types are rendered in a more human readable format, i.e.
Mulitlink, Link and Date are rendered in a better string representation.

For example for users the realname and not the id is rendered. The date
string is either only a date (if hour and minute are both zero) or date
plus hour and minutes, a multilink becomes a string of values separated
by ';'. The code is not really beautiful but should serve as a
specification on what should be added to make the CSV export more useful
to my understanding. The function as an extension is added to this issue.