More refactoring

Post style should now be done
Page style should now be done
Index style should now be done

Features missing:
* Post : prev/next links
* Post : post tags

Issues: Not sure if I broke this now, or if it was ever intended to
work, but adding tags to a published post doesn't seem to work
        Tag page becomes empty, also, tags and their headers are not
transferred to the new way of working. Tags try to have their header
inside #article-main, probably needs hacking in blah or Makefile.
        Why doesn't it show up as @PAGE_TITLE@ In the #article-header?

Not quite ready for prime-time...