Addthis changes, but confused as to why play.php and preview.php are different in this branch to the files on our main install.
Addthis changes, but confused as to why play.php and preview.php are different in this branch to the files on our main install.

torinfo/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits,torinfo/xerteonlinetoolkits,thexerteproject/xerteonlinetoolkits