added feature(s) for BPM to support:

  - to calculate of expected start/stop date
  - to get remaining trade_phase list

and update some related code:
  - ERP5Site can be get simulation state list from related workflows
  - typo



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@27190 20353a03-c40f-0410-a6d1-a30d3c3de9de