force quote strings with spaces

[oflebbe]

Hi,

libreoffice version 4 (yeah, it's ancient ...) does not import fields with embedded whitespaces correctly. For instance a field with contents "hi" there will be exported to ;""hi"" there; , but libreoffice does not honour the seperator tripping over later fields.

Even Excel 2010 does not import ;""hi"" there; correctly: It displays the double quote chars, not a single one.

With the supplied patch, the field will be exported as ;"""hi"" there"; which leads to correct exports in both libreoffice 4 and excel 2010.

[oflebbe]

Errr, The travis-ci error seems to be unrelated to my patch?