- support profit & loss calculation when having only 1 level of equity categories
- take preference into account for date format
AccountModule_viewProfitAndLossReport:
- take preference into account for date format
- fix invalid ODF

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@23148 20353a03-c40f-0410-a6d1-a30d3c3de9de