[REF] stock_account: pre migration cleaning

* All methods are converted into an api.multi style (using ids instead of
  a browse record or an id)
* Dead code on product.template model: existing method on product.product
  has to be used
* ``_get_accounting_data_for_valuation`` and ``_prepare_account_move_line``
  methods moved on the stock.move model as their primary object is a
  stock move
* Simplified implementation and call parameters of ``_get_price`` of
  account.invoice.line to ease code understanding

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