this merges the send_text_P() updates from APM git-svn-id: https://arducopter.googlecode.com/svn/trunk@1788 f9c3cf11-9bcb-44bc-f272-b75c42450872
git-svn-id: https://arducopter.googlecode.com/svn/trunk@1710 f9c3cf11-9bcb-44bc-f272-b75c42450872