Mapping Tax

The Magento tax group will be imported in openerp in the object 'magento.tax.group'.
For each group we will manually select the default taxe linked to this group.

For exemple:

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| Tax Group | linked OpenERP tax m2m |
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| Group Tax 19.6 | Tax 19.6 |
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| Group Tax 19.6 and eco tax 2 | Tax 19.6 / Eco-tax 2 |
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Then on a product if the taxes are "19.6" we search in the magento tax group and chose the group called "Group Tax 19.6"
Then on a product if the taxes are "19.6 and 2" we search in the magento tax group and chose the group called "Group Tax 19.6 and eco tax 2"