Potential workaround follows, but the real fix will be to make the
availability of code in the lib directory consistent.

Put this at the top of a schema.py which depends on code in the lib
directory: 

import os.path
import sys

libdir = os.path.join(db.config.TRACKER_HOME, 'lib')
if libdir not in sys.path :
    sys.path.insert(0,libdir)

import quirky