RecurringInvoice and periodical jobs

[carlos]

Find a way to generate recurring invoices with the object's cron like Job related object.

[jzarate]

r369 added "generateInvoice" method to RecurringInvoice?, to generate a new invoice upon calling

[jzarate]

some points about the strategy:

• the recurring invoice has the scheduling fields within:
  • month
  • day_of_week
  • day_of_month

• the recurring invoice has a "generateInvoice" method that creates an invoice with the same client & payment data that the recurring template.
• the issue date is set as the date the "generateInvoice" method was called. the due date is set according to the issue date and the "days_to_due" field.

[jzarate]

r429

• added a few new filters at recurring_invoice listing related to scheduling:
  • active: recrring invoices that are still not "exhasuted"
  • exhausted
  • this month: recurring invoices that are to generate invoices this month
  • today: recurring invoices that are to generate invoices today.
• also, added the recurringinvoicefinder methods:
  • toGenerateThisMonth($date)
  • toGenerateThisDay($date)

[jzarate]

r431

• first draft of the "siwapp:check-jobs" task

[jzarate]

r537 new paradigm for scheduling jobs

[jzarate]

r541 finder class reworked with the new scheduling paradigm

[jzarate]

r542 more adjustments to the CheckJobs? task.