bugfix in dependency check, i.e. "erp5_core (>= 1.0rc12)" should be splited into "erp5_core" and "(>= 1.0rc12)".

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@16014 20353a03-c40f-0410-a6d1-a30d3c3de9de