Projects: a project can now be invoiced four ways from the same "Invoice this project" action as a single fixed-price line, one line per task, one line per timesheet entry, or one line per milestone. The modes the project cannot use yet are shown greyed out with the reason.
Projects: the invoice dialog now lists what will land on the invoice before it is created the tasks (with their status), timesheet entries or milestones with checkboxes to pick the tasks or milestones to bill and a running total.
Tasks: a task can carry a price (staff only), used when the project is invoiced per task. It is shown on the task page.
Milestones: a milestone can carry a price (staff only), used when the project is invoiced per milestone. It is shown as a column in the project's milestone list.
Updates
Projects: invoicing timesheets now prints the date and time of each entry under the task title on the invoice line, so the client can match every line to the day the work was done.
Projects: tasks and milestones that were billed are marked as finished and are never offered for invoicing again; deleting the invoice hands them back, the same way timesheet entries already worked.
