hgweb: Keep session variables (currently only style) in HTML forms, too.
Adjusted default and gitweb template for this.
Content-type: text/html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<link rel="icon" href="#url#static/hgicon.png" type="image/png">
<meta name="robots" content="index, nofollow" />
<link rel="stylesheet" href="#url#static/style.css" type="text/css" />