[ADD] Migration scripts for mass_editing

mass_editing/migrations/9.0.1.0.0/openupgrade_analysis.txt

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+---Fields in module 'mass_editing'---
+mass_editing / mass.object              / model_ids (many2many)         : DEL relation: ir.model
+mass_editing / mass.object              / model_list (char)             : NEW 
+mass_editing / mass.object              / ref_ir_act_window (many2one)  : DEL relation: ir.actions.act_window
+mass_editing / mass.object              / ref_ir_act_window_id (many2one): NEW relation: ir.actions.act_window
+mass_editing / mass.object              / ref_ir_value (many2one)       : DEL relation: ir.values
+mass_editing / mass.object              / ref_ir_value_id (many2one)    : NEW relation: ir.values
+---XML records in module 'mass_editing'---

mass_editing/migrations/9.0.1.0.0/openupgrade_analysis_work.txt

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+---Fields in module 'mass_editing'---
+mass_editing / mass.object              / model_ids (many2many)         : DEL relation: ir.model
+mass_editing / mass.object              / model_list (char)             : NEW
+# NOTHING TO DO
+
+mass_editing / mass.object              / ref_ir_act_window (many2one)  : DEL relation: ir.actions.act_window
+mass_editing / mass.object              / ref_ir_act_window_id (many2one): NEW relation: ir.actions.act_window
+# Done: pre-migration: Renamed fields.
+
+mass_editing / mass.object              / ref_ir_value (many2one)       : DEL relation: ir.values
+mass_editing / mass.object              / ref_ir_value_id (many2one)    : NEW relation: ir.values
+# Done: pre-migration: Renamed fields.
+
+---XML records in module 'mass_editing'---

mass_editing/migrations/9.0.1.0.0/pre-migration.py

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+# -*- coding: utf-8 -*-
+# Copyright 2017 Eficent <http://www.eficent.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from openupgradelib import openupgrade
+
+
+_field_renames = [
+    ('mass.object', 'mass_object', 'ref_ir_act_window',
+     'ref_ir_act_window_id'),
+    ('mass.object', 'mass_object', 'ref_ir_value', 'ref_ir_value_id'),
+]
+
+
+@openupgrade.migrate(use_env=True)
+def migrate(env, version):
+    openupgrade.rename_fields(env, _field_renames)