hgweb: Keep session variables (currently only style) in HTML forms, too.
Adjusted default and gitweb template for this.
#header#
<title>#repo|escape#: tags</title>
<link rel="alternate" type="application/rss+xml"
href="#url#rss-tags" title="RSS feed for #repo|escape#: tags">
</head>
<body>
<div class="buttons">
<a href="#url#log{getentries}">changelog</a>
<a href="#url#shortlog{getentries}">shortlog</a>
<a href="#url#file/#node|short#/{getentries}">manifest</a>
<a type="application/rss+xml" href="#url#rss-tags">rss</a>
</div>
<h2>tags:</h2>
<ul id="tagEntries">
#entries%tagentry#
</ul>
#footer#