Improve docstrings.
Add descriptions to properties that misses them.
Add warnings on properties that should not be used.
Remove financial_year_stop_date from Organisation, because accounting period replaces it.



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@6869 20353a03-c40f-0410-a6d1-a30d3c3de9de