[CLEAN] product and various: light model / code cleaning

Main changes summarized

product
- [REM] weight_net field. Weight net is removed from the product model.
Indeed a product should be modeled without its possible packaging data.
Moreover in the codebase the weight_net field is not really used.
- unused import
- removed _common.py file holding wrappers for tools (rouding and
ceiling), used only once in the codebase

purchase
- unused imports

purchase_requisition
- dead code
- purchase_requisition: from boolean to selection, because V > M

stock
- [REM] qty_available2, logic, loc_rack, loc_row, loc_case fields. location_id
and warehouse_id moved from the product to the template to ease the
configuration.
- [ADD] description_picking field

stock_account
- [REM] date_account field on stock.inventory

misc wording (sale_margin, ...), notably Cost Price renamed to Cost.

1 files changed, 4 insertions, 2 deletions

diff --git a/addons/mrp/mrp.py b/addons/mrp/mrp.py
index de8bd18a3d5..c523523d679 100644
--- a/addons/mrp/mrp.py
+++ b/addons/mrp/mrp.py
@@ -10,7 +10,6 @@ from openerp.tools import DEFAULT_SERVER_DATE_FORMAT
 from openerp.tools import float_compare, float_is_zero
 from openerp.tools.translate import _
 from openerp import tools, SUPERUSER_ID
-from openerp.addons.product import _common
 from openerp.exceptions import UserError, AccessError
 
 
@@ -276,7 +275,10 @@ class mrp_bom(osv.osv):
 
         def _factor(factor, product_efficiency, product_rounding):
             factor = factor / (product_efficiency or 1.0)
-            factor = _common.ceiling(factor, product_rounding)
+            if product_rounding:
+                factor = tools.float_round(factor,
+                                           precision_rounding=product_rounding,
+                                           rounding_method='UP')
             if factor < product_rounding:
                 factor = product_rounding
             return factor