bundled zetuptoolz: prefer locally-available distributions over remotely-downloaded...

bundled zetuptoolz: prefer locally-available distributions over remotely-downloaded distributions above all
This fixes #1233. Actually the previous patches—[20101103034740-93fa1-9df33552497282eb72a84e5b434d035974bf2dbb] and [20101117080828-92b7f-dc0239f30b26e7e5d40b228114fb399c1e190ec5]—fixed it, but with them zetuptoolz would download a higher-numbered distribution from the net instead of using the locally-available (fake) pycryptopp-0.5.24, thus preventing the tests from passing. This patch changes that behavior (which is an improvement in its own right) and also fixes a bug in the tests.