zope-instance/buildout.cfg:
 - reuse more of software_definition trick
 - reenable products
development.cfg, official.cfg and minimal.cfg:
 - initiate ERP5 software
erp5-software/buildout.cfg:
 - define ERP5 software component


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31921 20353a03-c40f-0410-a6d1-a30d3c3de9de