The fiscal years are created centered on the passed date such that if the current day change during the execution, the fiscal year is still usable. Also fiscal year can be created for a range of dates such that it is guarantee that the dates are in the fiscal year. And finally remove datetime and dateutil import when they are not used. Closes #9977
Project Invoice Module ###################### The Project Invoice module adds invoice methods on project. The methods are: - Manual: Tryton doesn't create any invoice. - On Effort: The invoices are created based on the *Effort* hours for all children works with 100% progress. - On Progress: The invoices are create proportionally to the *Progress* of the *Effort* hours of each children work. - On Timesheet: The invoices are created based on the timesheets encoded on all children works.