[ADD] print, print_docsaway, print_sale : module to print and send docum...

...ents by post, implementation for docsaway webservices.

Print and send documents by post
print : provider base module to print account.invoice
print_sale : print and send sale.order
print_docsaway : implementation of docsAway Provider
Shouldn't you also support the 'active_domain' key ? When selecting all records of a list view, the list view sends the current domain as active_domain. This allows to avoid having 5000 ids in active_ids, just having a domain instead.