deprecate wp_specialchars() in favor of esc_html(). Encode quotes for esc_html() as in esc_attr(), to improve plugin security.

git-svn-id: https://develop.svn.wordpress.org/trunk@11380 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/plugin-install.php

@@ -56,7 +56,7 @@ include('admin-header.php');
 ?>
 <div class="wrap">
 <?php screen_icon(); ?>
-<h2><?php echo wp_specialchars( $title ); ?></h2>
+<h2><?php echo esc_html( $title ); ?></h2>
 
 	<ul class="subsubsub">
 <?php