* Dear human beings; this is a major overhaul of the banner area in all of my skins. (index.template.php, script.js, index.css, sections.css, Warm/extra.css, Wilde/extra.css, Wine/extra.css, Wuthering/extra.css, extra.ie6.css, install.css, install.php, readme_install.html)

  Renamed #upper_section to #banner. Makes sense.
  Using different margins per skin was a bad idea, and not very responsive, so I'd wanted to change that for a long time. The default is now just two barely styled h1/#slogan elements, and they use different techniques to achieve different positioning across all skins. It makes for an interesting study for those who are into CSS, I suppose.
  Banners are now elastic vertically in Weaving, Wilde and associated mobile versions. The reason it's not in Wine and its children Warm and Wuthering, is because Wine is using a static background of a fixed height (100px), so I'm sticking to a static height for it.
  The h1 tag is now styled alone, without any preceding classes or IDs. This is because it's only used in one place (forum title); even though HTML5 allows for multiple h1 tags, I prefer not to bother.
  Wine now uses CSS's multiple backgrounds feature. Well, what then?
  Also updated install scripts, although they were unrelated to begin with.

@ Needs more testing. I did a LOT of that over the weeks I spent on this rewrite, but I have a feeling something's gonna fail sooner than later.