Merge from trunk 2747:

- Install process now looks like goto/roma.
- Move install.tpl to goto template.
- add charset utf8 to fatal error function.
- Check php version on install and upgrade, and die if < 5. 


git-svn-id: http://piwigo.org/svn/branches/2.0@2748 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_html.inc.php

@@ -671,7 +671,8 @@ function fatal_error($msg)
     $msg .= "\n";
   }
 
-  $display = "<h1>Piwigo encountered a non recoverable error</h1>
+  $display = "<meta http-equiv='Content-Type' content='text/html; charset=utf-8'>
+<h1>Piwigo encountered a non recoverable error</h1>
 <pre style='font-size:larger;background:white;color:red;padding:1em;margin:0;clear:both;display:block;width:auto;height:auto;overflow:auto'>
 <b>$msg</b>
 $btrace_msg