Module.py: make get_db() threadsafe by having it create a new connection every time

Module.py

@@ -184,7 +184,10 @@ class Module(object):
         See also db_module_registered, below.
         """
 
-        return self.conn
+        dbfile = self.config.get('dr.botzo', 'database')
+        conn = sqlite3.connect(dbfile)
+        conn.row_factory = sqlite3.Row
+        return conn
 
     def db_module_registered(self, modulename):
         """