[FIX+IMP] account_chart_update: Several things

* search on code first to match tax codes

  The tax code code should be more discriminant that the tax code name.

* compare more fields in tax codes
* deletion of tax codes removed from templates

  For tax codes, it make sense to propose deletion, since tax codes
  are normally defined by the tax authority and the user does not
  customize them.

* update accounts on taxes even if an update of the account was not requested

  Useful when the chart of taxes changes but the chart of account
  need not be updated.

* depth-first search of tax codes

  This helps creating parents before children.

* compare more fields in taxes
* add active field on tax code

  Deactivate tax codes which are not in the template.

* deactivate taxes that are not in the template
* multi-company criteria for taxes
* avoid inserting duplicates in presence of inactive taxes or tax codes

account_chart_update/model/account_tax_code.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    OpenERP, Open Source Management Solution
+#    Copyright (c) 2014 ACSONE SA/NV (http://acsone.eu)
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as published
+#    by the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+from openerp import models, fields
+
+
+class AccountTaxCode(models.Model):
+    _inherit = 'account.tax.code'
+
+    active = fields.Boolean('Active', default=True)