[ADD] mail,sale,stock,purchase,event,pos: Source document clickable in chatter

PURPOSE:
The source document should be in the chatter and clickable

NEW MAIL TEMPLATE:
mail: new template 'message_origin_link' with clickable link to origin
Variables to pass:
- origin: the record from which the current record had been created
- self: The current record
Optional:
- edit: If true, the record has been modified. Otherwise it has been created
  from the origin

SPECIFICATION:
Source Document is available in following models
1) After creating SO then Sale to Invoice -> Source Document (After creating Sales Order and then clicking on Create invoice)
2) When procurement is created after SO or MO or Order Point(procurement.order) - > Source Document
3) Stock.picking -> Source Document ( After Creating SO or PO)
4) When Manufacturing Order is Created (mrp.production) -> Source Document (Coming after creating a sale order of product)
5) Event -> Attendees(event.registration) -> Source Document
6) Request For Quotation -> Source Document (After creating Purchase Tender, SO)
7) In Purchase Tender(purchase.requisition) -> Source Document (When a new Purchase Tender is Created)
8) After creating PO then create invoice(vendor bill)-> Source Document
9) After creating Invoice from contract (subscription) - > source Document.
10) Refund invoice from Invoice --> Source Document.
11) Return picking from picking --> Source Document.
12) sale use POS to create invoice and picking -->  Source Document.

MESSAGES TO DISPLAY:
-In Customer Invoice, there is a source document of Sale Order.
 "This Invoice has been created from Sale Order(s): SO001, SO002"

-In Procurement, the source document can be either of Sale Order or Manufacturing Order or Order Point.
 "This procurement is created from: SO001 or MO0001 or OP/0001"

-In Stock Picking, the source document can be either of Sale Order or Purchase Order.
 "This transfer has been created from sales order(s): SO001 or PO0001"

-Create new Sales order of manufactured product , there will be Source Document with that Sale Order number
"This production has been created from procurement(s): WH: Stock -> CustomersMTO"

-When registering for Event from website, Sale Order is Created and it is stored in Source Document,
 "The attendee has been created from Sale order: SO001"

-In RFQ, the source document can be either Purchase Tender or Sale Order or Order Point,
 "This purchase order has been created from purchase requisition(s): TE0001 or SO001 or OP/0001"

-In Purchase Tender, the source document can be either of Sale Order/ Manufacturing Order/ Order Point.
 "This Purchase Requisition has been created from: WH: Stock -> CustomersMTO"

-In Vendor bill, there is a source document of Purchase Order.
 "This Vendor bill has been created from Purchase Order(s): PO0001, PO002"

-When creating refund of invoice
 "This customer invoices refund has been created from customer invoices: INV/2016/0001"

-when create invoice and picking form pos.
 "This invoce has been create from point of sale: MainXX"

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