---------------

- A new command-line argument, -U, suppresses reading user defaults.

- You can now suppress use of an installed-part database
  (e.g. .installed.cfg) by sprifying an empty value for the buildout
  installed option.


git-svn-id: http://svn.zope.org/repos/main/zc.buildout/trunk@71488 62d5b8a3-27da-0310-9561-8e5933582275