webinterface: Add links to the configuration wiki

This patch adds a little "help" icon to the page header.
If a manual entry exists for a configuration page, the icon
appears and offers a quick way to access the wiki.
Wiki pages can be configured in the "manualpages" file.

Signed-off-by: Leo-Andres Hofmann <hofmann@leo-andres.de>
Reviewed-by: Bernhard Bitsch <bbitsch@ipfire.org>
Tested-by: Bernhard Bitsch <bbitsch@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>

html/html/themes/ipfire/include/css/style.css

@@ -169,6 +169,19 @@ iframe {
 	margin-bottom: 1em;
 }
 
+#main_header > * {
+	display: inline-block;
+	vertical-align: baseline;
+}
+
+#main_header > span {
+	margin-left: 0.8em;
+}
+
+#main_header img {
+	padding: 0;
+}
+
 #footer {
 	height: 2.5em;
 	margin-bottom: 1em;

html/html/themes/ipfire/include/functions.pl

@@ -170,7 +170,22 @@ END
 print <<END
 	<div class="bigbox fixed">
 		<div id="main_inner" class="fixed">
-			<h1>$title</h1>
+			<div id="main_header">
+				<h1>$title</h1>
+END
+;
+
+# Print user manual link
+my $manual_url = &Header::get_manualpage_url($scriptName);
+if($manual_url) {
+	print <<END
+				<span><a href="$manual_url" title="$Lang::tr{'online help en'}" target="_blank"><img src="/images/help-browser.png" alt="$Lang::tr{'online help en'}"></a></span>
+END
+;
+}
+
+print <<END
+			</div>
 END
 ;
 }