[ADD] Creation of a module to send documents via classical postal ways. ...

...This module uses the DocsAway web service. It allows to send single documents or multiple ones (thanks to selection in list views). Here, invoices and sale orders are ready to use

So far, this module is in debug mode (sending a mail doesn't really send one, but in the DocsAway account, you can verify the good reception of the mail). Once the review done, I will set it in production mode
Ah yes, you're absolutely right for the test mode ^^ I added a new boolean field in ir.config_parameter for that.
For the model without fields, I took as example the file google_account/google_account.py. Having a "regular" class allow me to access other ones easily thanks to self.env[model_name] (otherwise, I don't have self...)
For the others global variables (urls, pattern), I can convert them into fields values :)