Merge from product_installation_tracking branch. The product install now keeps a dict of installed products, and ZopeTestCase checks it, so not to install products twice.

  Update Five to release 1.0.1.

Added test for strftime with unicode pattern.

      - Collector #1323: applied patch to fix umask problem in zdctl

      - Collector #1323: applied patch to fix umask problem in zdctl

Use ZODB 3.4b3.

Stop using deprecated txn_mgr= argument; use
transaction_manager= instead.  Stop "illegal" use of
Connection's private ._txn_mgr attribute; use the new
public .transaction_manager attribute instead.

Stop using deprecated txn_mgr= argument; use
transaction_manager= instead.  Stop "illegal" use of
Connection's private ._txn_mgr attribute; use the new
public .transaction_manager attribute instead.

Collector #889 -- thanks to 'aroda' for the patch!

- Note about the change

- Make it so webdav-source server is distinguishable from the default http server in the ZMI and event.log

inet-address default, which does not make a lot of sense for binding

      - Collector #1780: DateTime.strftime() now handles dates <= 1900 or
        >= 2038

without touching sys.path and without the help of imp.