Remove duplciated intercompany_user field created here in this modules

and in the comapny_user modules that it's a dependency.

__init__.py

@@ -8,5 +8,4 @@ def register():
     Pool.register(
         invoice.Invoice,
         invoice.InvoiceLine,
-        invoice.Company,
         module='account_invoice_intercompany', type_='model')

invoice.py

@@ -6,15 +6,6 @@ from trytond.pool import Pool, PoolMeta
 from trytond.pyson import Equal, Eval, If, Bool
 from trytond.transaction import Transaction
 
-__all__ = ['Invoice', 'InvoiceLine', 'Company']
-
-
-class Company(metaclass=PoolMeta):
-    __name__ = 'company.company'
-    intercompany_user = fields.Many2One('res.user', 'Company User',
-        help='User with company rules when create a intercompany sale '
-            'from purchases.')
-
 
 class Invoice(metaclass=PoolMeta):
     __name__ = 'account.invoice'