Commonify Recurring Sales Order/Invoice
Add manage_recurring_documents and path to hooks, fix minor issues
Add tests for Recurring Document, Sales Inv, Sales Order, fix minor errors
Add patch for field name change in SI, rename email template
Fix minor errors, fix patch, call in hooks, move from account_controller to recurring_document
fix minor issue and set default value send as pdf
Merge pull request #2109 from ankitjavalkarwork/recurringorder2

Commonified Recurring for Sales Invoice and Sales Order