fixes #693, pclzip compatibility with PHP 7.1

admin/include/pclzip.lib.php

@@ -1836,6 +1836,7 @@
     $v_memory_limit = ini_get('memory_limit');
     $v_memory_limit = trim($v_memory_limit);
     $last = strtolower(substr($v_memory_limit, -1));
+    $v_memory_limit = intval($v_memory_limit);
  
     if($last == 'g')
         //$v_memory_limit = $v_memory_limit*1024*1024*1024;