- Now we use effective model, so we need to define some more properties on model like reference, effective en exiparation date and version
- Dynamic date was not good, it's easier to understand and debug with static dates
- some date formats were not good
- udpate test_modelWithoutDateValidity to check the new behaviour
- add some Tic steps after creating the model because effective model are found using catalog


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28047 20353a03-c40f-0410-a6d1-a30d3c3de9de