Export folder patch

[Jean-Christophe Dubacq <jcdubacq1 free fr>]

Hello,

 Here is my first meaningful patch. It corrects the output of the export
folder patch by specifying the charset. This is important for all people
using non-iso-8859-1 locales.

Please review it. It's an easy one, but it's what I can do (for now).
-- 
JCD

--- f-spot-0.1.10orig/src/FolderExport.cs	2006-02-23 17:27:56.000000000 +0100
+++ f-spot-0.1.10/src/FolderExport.cs	2006-03-20 19:48:10.000000000 +0100
@@ -22,6 +22,7 @@
 using System;
 using System.IO;
 using System.Runtime.InteropServices;
+using System.Text;
 
 using ICSharpCode.SharpZipLib.Checksums;
 using ICSharpCode.SharpZipLib.Zip;
@@ -787,6 +788,10 @@
 		public void WriteHeader (System.Web.UI.HtmlTextWriter writer)
 		{
 			writer.RenderBeginTag ("head");
+			writer.Write ("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=");
+			writer.Write (System.Text.Encoding.Default.WebName);
+			writer.Write ("\" />");
+
 			writer.RenderBeginTag ("title");
 			writer.Write (gallery_name);
 			writer.RenderEndTag ();