merge -c2880 from trunk to branch 2.0

- Add fetchRemote function which allow to retrieve datas over HTTP protocol using cURL method, file_get_contents function or fsockopen method. This allow to retrieve datas or files even if allow_url_fopen is deactivated.
- Use fetchRemote function in plugins manager and in latest version checking.
- Add german translations for upgrade.lang.php.
- Remove empty line at the end of pclzip.lib.php.
- Change display of deactivated plugins after upgrade.

git-svn-id: http://piwigo.org/svn/branches/2.0@2881 68402e56-0260-453c-a942-63ccdbb3a9ee

admin/include/plugins.class.php

@@ -268,8 +268,7 @@ DELETE FROM ' . PLUGINS_TABLE . ' WHERE id="' . $plugin_id . '"';
     $version = PHPWG_VERSION;
     $versions_to_check = array();
     $url = PEM_URL . '/api/get_version_list.php?category_id=12&format=php';
-    if ($source = @file_get_contents($url)
-      and $pem_versions = @unserialize($source))
+    if (fetchRemote($url, $result) and $pem_versions = @unserialize($result))
     {
       if (!preg_match('/^\d+\.\d+\.\d+/', $version))
       {
@@ -308,9 +307,9 @@ DELETE FROM ' . PLUGINS_TABLE . ' WHERE id="' . $plugin_id . '"';
       $url .= $new ? '&extension_exclude=' : '&extension_include=';
       $url .= implode(',', $plugins_to_check);
     }
-    if ($source = @file_get_contents($url))
+    if (fetchRemote($url, $result))
     {
-      $pem_plugins = @unserialize($source);
+      $pem_plugins = @unserialize($result);
       if (!is_array($pem_plugins))
       {
         return false;
@@ -321,6 +320,7 @@ DELETE FROM ' . PLUGINS_TABLE . ' WHERE id="' . $plugin_id . '"';
       }
       return true;
     }
+    return false;
   }
   
   /**
@@ -357,8 +357,10 @@ DELETE FROM ' . PLUGINS_TABLE . ' WHERE id="' . $plugin_id . '"';
     {
       $url = PEM_URL . '/download.php?rid=' . $revision;
       $url .= '&origin=piwigo_' . $action;
-      if (@copy($url, $archive))
+
+      if ($handle = @fopen($archive, 'wb') and fetchRemote($url, $handle))
       {
+        fclose($handle);
         include(PHPWG_ROOT_PATH.'admin/include/pclzip.lib.php');
         $zip = new PclZip($archive);
         if ($list = $zip->listContent())