pep8 blank lines fixes

flake8 --select W391,E302,E301,E304

autopep8 can't fix W391 even though it claims it can.
Fixed using a simple custom script.

modules/creditcooperatif/pro/pages.py

@@ -95,6 +95,7 @@ class Transaction(FrenchTransaction):
                                                             FrenchTransaction.TYPE_UNKNOWN),
                ]
 
+
 class ITransactionsPage(Page):
     def get_next_url(self):
         # can be 'Suivant' or ' Suivant'
@@ -108,6 +109,7 @@ class ITransactionsPage(Page):
     def get_history(self):
         raise NotImplementedError()
 
+
 class TransactionsPage(ITransactionsPage):
     TR_DATE = 0
     TR_TEXT = 2
@@ -135,6 +137,7 @@ class TransactionsPage(ITransactionsPage):
 
             yield t
 
+
 class ComingTransactionsPage(TransactionsPage):
     TR_DATE = 2
     TR_TEXT = 1
@@ -142,6 +145,7 @@ class ComingTransactionsPage(TransactionsPage):
     TR_CREDIT = -1
     TABLE_NAME = 'operationAVenir'
 
+
 class CardTransactionsPage(ITransactionsPage):
     COM_TR_COMMENT = 0
     COM_TR_DATE = 1