Fix missing global identifier in Spellbooks.py
Just found out it's not a gemrb bug, but a game data bug. Fixed with fixpack.
Dual class not working.
Merchant in Nashkel store doesn't work.
Gee, make install and running from PATH fixed it, so not a bug.
Forgot to say, it's built from current git with Wintermute support enabled.
WINTERMUTE: Chivalry throws error at startup.
Added a patch for substituting the missing callback errors for a warning.