- Updated BaseTheme and the Drupal themes to have header($title = "") as the...

- Updated BaseTheme and the Drupal themes to have header($title = "") as the header declaration and use title when provided. This is just a step towards having unique titles.
In all themes, except Marvin which already had $title, I put the $title first, because it's usually the thing the page is about:

"The future of weblogs? - Drop.org"
"Your account settings - Drop.org"

rather than the other way around, right?