Remove ODT generation from scratch

[aurelien.bompard.org]

In the future, I'll probably remove the ODT generation from scratch using the included styles.xml, and only leave the template system.

Cons:

• People using the “styles.xml-replacement method” will need to switch to using a template (method 1 in "Customizing" on the main wiki page)

Pros:

• Less code to maintain
• Easier to follow the evolutions of the OpenDocument format
• Most people use the template system anyway
• There will be a default template for all pages, that you will be able to customize, instead of adding the template tag to all pages.

Of course, I'll provide a template containing all the styles used in wiki:syntax.