Changes

I have created an example to modify Libre Office documents the same way as Office 2007 documents. It's mainly working, still some problems appear:

- if "content.xml" is too big (for example 250 ko) baseX raises a java StackOverflow error...

- when you open your result document Test.ods, Libre Office tells you that the document is corruptes but it is able to repair it and you end up with the right document. Still it's not very elegant.

declare namespace zip = "http://expath.org/ns/zip";