[IMP] Inventory valuation: update documentation

The documentation page has been cleaned to avoid repeating some information. 
Some information has also been changed to be up to date with new version.

inventory/management/reporting/inventory_valuation_config.rst

@@ -63,10 +63,10 @@ Standard Price
        - +2*€10
        - €40
 
-  **Standard Price** means you estimate the cost price based 
-  on direct materials, direct labor and manufacturing overhead 
-  at the end of a specific period (usually once a year). You 
-  enter this cost price in the product form.
+  In **Standard Price**, any product will be valued at the cost that you defined
+  manually on the product form. Usually, this cost is an estimation based
+  on the material and labor needed to obtain the product. This cost must
+  be reviewed periodically.
 
 Average Price
   .. rst-class:: values-table
@@ -108,21 +108,12 @@ Average Price
        - +2*€6
        - €36
 
-  The **Average Price** method recomputes the cost price as a receipt order 
-  has been processed, based on prices defined in tied purchase orders:
-  FORMULA (see here attached)
+  In **AVCO (Average Cost)**, each product has the same value and this 
+  value is the average purchase cost of the product. With this costing method, the
+  cost of the product is recomputed as each receipt.
 
   The average cost does not change when products leave the warehouse.
 
-  From an accounting point of view, this method is mainly justified in 
-  case of huge purchase price variations and is quite unusual due to its 
-  operational complexity. Your actually need a software like Odoo to 
-  easily keep this cost up-to-date.
-
-  This method is dedicated to advanced users. It requires well established 
-  business processes because the order in which you process receipt orders 
-  matters in the cost computation.
-
 FIFO
   .. rst-class:: values-table
 
@@ -163,51 +154,17 @@ FIFO
        - +2*€6
        - €44
 
-  For **Real Price** (FIFO, LIFO, FEFO, etc), the costing is further 
-  refined by the removal strategy set on the warehouse location 
-  or product's internal category. The default strategy is FIFO. With 
-  such method, your inventory value is computed from the real cost 
-  of your stored products (cfr. Quantitative Valuation) and not from 
-  the cost price shown in the product form. Whenever you ship items, 
-  the cost price is reset to the cost of the last item(s) shipped. 
-  This cost price is used to value any product not received from a 
-  purchase order (e.g. inventory adjustments).
+  In **FIFO (First In First Out)**, the products are valued at their
+  purchase cost. When a product leaves the stock, that’s the “First in, 
+  first out” rule that applies.
   
-  FIFO is advised if you manage all your workflow into Odoo (Sales, 
+  Pay attention, that this is a financial FIFO. The first value “in” 
+  is the first value “out”, no matter the storage location, warehouse
+  or serial number.
+
+  FIFO is advised if you manage all your workflows into Odoo (Sales, 
   Purchases, Inventory). It suits any kind of users.
 
-Standard Price
---------------
-
-In Standard Price, any product will be valued at a cost that you defined
-manually on the product form. Usually, this cost is an estimation based
-on the material and labor needed to obtain the product. This cost must
-be reviewed periodically.
-
-First In First Out (FIFO)
--------------------------
-
-In FIFO, the products are valued at their purchase cost. When a product
-leaves the stock, that’s the “First in, first out” rule that applies.
-Let’s take an example: I first purchase a t-shirt for $10 and, later,
-one for $20. The first t-shirt that will go out of my stock will be
-valued at $10 and the next one at $20.
-
-.. tip::
-		Pay attention, that this is a financial FIFO. This means that the
-		locations where the products are stored don’t impact the valuation. The
-		first value “in” is the first value “out”, no matter the storage
-		location.
-
-Average Cost (AVCO)
--------------------
-
-In AVCO, each product has the same value and this value is the average
-purchase cost of the product. Let’s take an example: I first purchase a
-t-shirt for $10 and, later, one for $20. Each t-shirt will be valued at
-$15, the average weighted purchase cost. With this costing method, the
-cost of the product is recomputed as each receipt.
-
 Inventory Valuation: Manual or Automated
 ========================================
 
@@ -215,6 +172,18 @@ There are two ways to record your inventory valuation in your accounting
 books. As the costing method, this is defined in your product category.
 Those two methods are detailed below.
 
+It is important to also note that the accounting entries will depend on
+your accounting mode: it can be continental or anglo-saxon. In
+continental accounting, the cost of a good is taken into account as soon
+as the product is received in stock. In anglo-saxon accounting, the cost
+of a good is only recorded as an expense when this good is invoiced to a
+final customer. In the tables below, you can easily compare those two 
+accounting modes.
+
+Usually, based on your country, the correct accounting mode will be
+chosen by default. If you want to verify your accounting mode, activate
+the developer mode and open your accounting settings.
+
 Manual Inventory Valuation
 --------------------------
 
@@ -223,29 +192,13 @@ on your accounting books. Periodically, you create a manual journal
 entry representing the value of what you have in stock. To know that
 value, go in Inventory > Reporting > Inventory Valuation.
 
-+----------------------------------+---------+----------+
-|                                  | Debit   | Credit   |
-+==================================+=========+==========+
-| Assets: Inventory                | X       |          |
-+----------------------------------+---------+----------+
-| Expenses: Inventory Variations   |         | X        |
-+----------------------------------+---------+----------+
-
-.. tip::
-		If the stock value has decreased, the assets account will be credited.
-
-Continental Accounting
-~~~~~~~~~~~~~~~~~~~~~~
-
-In a periodic inventory valuation, goods reception and 
-outgoing shipments have no direct impact in the accounting. 
-At the end of the month or year, the accountant posts one 
-journal entry representing the value of the physical inventory. 
-
 This is the default configuration in Odoo and it works 
 out-of-the-box. Check following operations and find out how 
 Odoo is managing the accounting postings.
 
+Continental Accounting
+~~~~~~~~~~~~~~~~~~~~~~
+
 .. rst-class:: alternatives doc-aside
 
 Vendor Bill
@@ -379,20 +332,6 @@ extra configuration & testing.
 First, you need to define the accounts that will be used for those
 accounting entries. This is done on the product category.
 
-.. image:: media/inventory_valuation_config_02.png
-    :align: center
-
-Note that the accounting entries that will be recorded will depend on
-your accounting mode: it can be continental or anglo-saxon. In
-continental accounting, the cost of a good is taken into account as soon
-as the product is received in stock. In anglo-saxon accounting, the cost
-of a good is only recorded as an expense when this good is invoiced to a
-final customer.
-
-Usually, based on your country, the correct accounting mode will be
-chosen by default. If you want to verify your accounting mode, activate
-the developer mode and open your accounting settings.
-
 Continental Accounting
 ~~~~~~~~~~~~~~~~~~~~~~