[FIX] project_timesheet: date of created analytic line not in user tz

When the user was in timezone UTC + 1, and added a project.task.work which created an analytic entry line (timsheet activity), if the datetime was set to 11/25 00:00:00, the date on the analytic line was set to 11/24, because this was the truncated stored value(UTC Time), which was 11/24 23:00:00
[FIX] account: prevent invoice line duplication on partner duplication

If a company contact (a partner with a company set as parent) had invoices, and the company of this contact was duplicated, all the invoices lines were duplicated,  on the original invoice moreover (new lines were added on existing invoices)
Merge remote-tracking branch 'odoo/7.0' into 7.0