[IMP] website_blog: url helper defintiion + use; still blog posts to fix.
[MERGE] Sync with trunk
[IMP] website_blog: use 2 different URL schemes (post and blog), to ease url use in templates
[CLEAN] website_blog :code cleaning in added code
[FIX] website_blog: who wrote such stupid domains ?
[MERGE] [IMP] website_blog: use a helper to generate the various URLs of blogs (using date, tags, blog, post, ...) + updated templates accordingly. This branch also fixes numerous bugs with URLs, notably Archives URLs that were completely buggy.

Also fixed strangely coded domain generation in blog route.