[IMP] XML import: float values are not passed as strings anymore

When you import a record from a XML file, values passed to float fields
are not casted as floats.

Eg: ``<field name="price">1.0</field>`` is parsed as '1.0' string.

The method _update from ir_model.py seems to accept these "fake floats"
strings BUT, if you override write() in a module, you can't guess that
values meant to be written in a float field are actually strings

Eg: The override of write() in sale.order.line expects a float and crash
at second install. (try twice `-i sale` in a 9.0 database)

In order to fix this, we apply the same reasoning than for integers
(two lines above).

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