Log Message:
Import py-IndexedCatalog from pkgsrc-wip.  Packaged by Michal Pasternak,
and slightly modified by me.

IndexedCatalog is an extension to the Zope Object Database (ZODB) that
provides indexing and allows queries for objects based on attributes.
Which is accomplished by indexing all fields by type
(string/integer/float) and by a simple query language.