Add history on payment term line delta

And use correct file names per class.

issue7866
review58421002

CHANGELOG

@@ -1,3 +1,5 @@
+* Add history on payment term line delta
+
 Version 5.0.0 - 2018-10-01
 * Bug fixes (see mercurial logs for details)
 * Remove support for Python 2.7

__init__.py

@@ -2,16 +2,17 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-from .party import *
-from .payment_term import *
-from .invoice import *
+from . import party
+from . import account
+from . import account_invoice
 
 
 def register():
     Pool.register(
-        Party,
-        Address,
-        PaymentTerm,
-        PaymentTermLine,
-        Invoice,
+        party.Party,
+        party.Address,
+        account.Invoice,
+        account_invoice.PaymentTerm,
+        account_invoice.PaymentTermLine,
+        account_invoice.PaymentTermLineRelativeDelta,
         module='account_invoice_history', type_='model')

account_invoice.py

@@ -2,8 +2,6 @@
 # this repository contains the full copyright notices and license terms.
 from trytond.pool import PoolMeta
 
-__all__ = ['PaymentTerm', 'PaymentTermLine']
-
 
 class PaymentTerm(metaclass=PoolMeta):
     __name__ = 'account.invoice.payment_term'
@@ -13,3 +11,8 @@ class PaymentTerm(metaclass=PoolMeta):
 class PaymentTermLine(metaclass=PoolMeta):
     __name__ = 'account.invoice.payment_term.line'
     _history = True
+
+
+class PaymentTermLineRelativeDelta(metaclass=PoolMeta):
+    __name__ = 'account.invoice.payment_term.line.delta'
+    _history = True