Implement a early draft way to deploy a cluster with 5 zopes:

 1 for distribution
 2 for activities
 2 for User usage with HAProxy.

http://sourceforge.net/projects/freetype/files/freetype2/2.4.5/README/view

This reverts commit 7095a385.

This reverts commit caef8700.

This permit projects add a default list without overwrite the method.

Move from _install and create installZopeStandalone.
Introduced thread_amount_per_zope
Define default number of threads as 4, instead 1.

The configurator.json will be used to validate the parameters, and
provide an API add parameters.

This reverts commit 6e73e829.

From original changelog:

- Fixed a serious privilege escalation issue. For more information see:
  http://plone.org/products/plone/security/advisories/20110622