Add header for the number of total pages

Fixes #266

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2291 f69abe3c-2ee2-4550-9a6d-17bd458115be
Use better error codes for disabled features

Fixes #338

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2292 f69abe3c-2ee2-4550-9a6d-17bd458115be