[ADD]Add new model to manage prices

__manifest__.py

models/__init__.py

models/acc_operation.py

models/acc_price_conf.py

security/ir.model.access.csv

views/acc_operation_views.xml

views/acc_price_conf_views.xml

views/menu_views.xml

wizard/__init__.py

wizard/acc_price_conf_wizard.py

wizard/acc_price_conf_wizard_views.xml