added module declaration
added AFIP authentication support code (WSAA)
added python package initialization
added company view for AFIP credentials (cuit, cert, pkey)
added test button and minor fixes
renamed class/methods to pyafipws_ to avoid name collisions
added 'electronic invoice' checkbox to account.journal
added button to test dummy AFIP webservice method
added electronic invoice type / point of sale in account.journal
moved electronic_invoice.py to journal.py

--HG--
rename : electronic_invoice.py => journal.py
added button to query enabled points of sale in AFIP
added support for dummy and last invoice query for AFIP webservices WSFEXv1 and WSMTXCA
added preliminary electronic invoice support (WSFEv1)
invoice: barcode field and verification digit
invoice: request CAE on validation (workflow)
added invoice barcode image generation using pyafipws PyI25 (PIL) helper
initial support for several webservices - added wsfexv1: foreign trade
fixed multiple ws name issues
fixed export permit issue (wsfexv1)
fixed issues with vat number