Template to write XTiger XML spec

[ssire]

Make a template to directly edit the XTiger XML spec. The template should output a HTML5 document directly viewable. For that purpose:

• edit table of content manually (no automatic generation yet)
• microformat markup, attribute, sample in the doc can be replaced with a simlpe tt as per wiki filter with wiki_lang=html
• wiki filter can be extended to support internal definition (<dfn id="truc">Truc</dfn>) with referencing for instance [Some new term][id] to create a definition and [id] to create reference (using an internal dictionary to automatically update text when changing the definition)
• wiki filter can be extended to support references with <cite> to bibliographical references
• source code with wiki filter and specific CSS to manually colorize some code extracts (see [1])
• table component, extend cells with a rowspan / colspan filter which can be dynamically hovered next to the cell

[1]

<xt:use handle="pre" types="text" label="pre"
 param="shape=parent;type=textarea;layout=placed;enablelinebreak=true;filter=wiki;wiki_lang=html">Source</xt:use>

The template should allow writing specs such as that one

[ssire]

I have done the template and rewritten current XTiger-XML-spec.html with it (commit 87e696a1d2c0c6301c3f). The document quality is essentially the same as it was, main difference is in table that cannot set colspan / rowspan yet, we need to make a colspan / rowspan filter to do so. Anyway the specification about XTiger XML will now be written using XTiger XML / AXEL itself !