Log Message:
update to 0.6.7

The 0.6.7 release fixes some bugs:
- be more backward-compatible when asking for EMAIL_CHARSET
- made error on create consistent with edit when user enters invalid data
  for Multilink and Link form fields (sf bug 904072)
- made errors from bad input in the quick "Show issue:" form more
  user-friendly (sf bug 904064)
- don't add a query to a user's list if it's already there
- nicer invalid property error in HTML templating
- use EMAIL_CHARSET for message body too (still sf bug 900046)