<text:s> element (etc) needs to be removed (ODF 1.2)

The <text:s> element is used by ODF to represent space characters in
text content.

Instead, the standard mechanism for representing space characters should
be used: i.e. space characters.

The current mechanism is confusing and contradicts/subverts the existing
Unicode-based mechanism of XML.

The same goes for <text:tab> and <text:line-break>

- Alex.