And now we have more options.
- CVS: can quote all values.
- HTML and XLSX: styles adjust, including a logo.
- XLSX: now has the same options as HTML
Also a fix in the "join" mechanism for "case insensitive" support.
The ColumnList class now is just a place holder for column names.
We just create the list of columns from the user preferences or
creating a good default and then we just use this list.