Work to do on documentation:

New docs:
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- Install guide on Windows (Apache && IIS).
- Chapter on web-hosting specific issues.
- daCode's internal docs ( database structure, and the engine works).

Translations:
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Nothing for now.

Proofreading:
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- Proofread the cache chapter

Updates:
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- Update customization chapter.
- Update site's admin chapter.
- Full PHP doc for the API.

Rendering:
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- 5 quasi-identical Makefile is an ugly thing (an include would be nicer, and more maintainable).
- Having a file with a random name in a CVS is also an ugly thing (webmaster/webmaster-fr/i1302.html)
- Remove the redundant "the Section called" in Xrefs.
