Better "Access Denied" for directory.bml

if you have a free account and attempt to do a directory search, you are presented with the error message "Sorry, your account type doesn't permit usage of the directory." which is a little vague and confusing.

I modified directory.bml so the result is now:

Sorry, your account type doesn't permit usage of the directory.
To upgrade your account type, visit the Paid Accounts page.

Please read FAQ Question 38 for additional information on account types.

the diff's
the directory.bml

This is untested. I would be very grateful if someone would toss it into their goathack.