Changed the main folder structure
Removed old unused readme
Removed old tests based on Simpletest
Restructuring folders
New module: companies
Some changse in views and fields
Restructured folders
New configuration section for billing Companies
Reestructured language folders
Simplified Bean
Support for default Company
Better company listview in config section
New icons for Companies. Removed icons for 'Invoice Items'
Assigned 'issuer company' in detail and edit view of 'invoices'
Company issuing the invoice inserted in PDF generation