Add Reader Comment, a bit more

A couple of minor escaping bugs have just been squashed (thanks to Steve for spotting them!) *mutters something unpleasant under his breath* :-) :-)

Something else I didn’t mention in the main announcement is that the emails sent out to diarists are now a little more informative. The biggest benefit will be to those with multiple diaries, as the subject line will now contain the username of the diary that was commented on as well as the username that made the comment itself.