Revert "If stock_lot is installed, allow computing lot quantites based on party."

This reverts commit 77f08d8d82.

__init__.py

@@ -24,7 +24,3 @@ def register():
     Pool.register(
         product.ProductByParty,
         module='stock_external_party', type_='wizard')
-    Pool.register(
-        stock.Lot,
-        depends=['stock_lot'],
-        module='stock_external_party', type_='model')

stock.py

@@ -7,7 +7,6 @@ from trytond.modules.stock.move import STATES, DEPENDS
 from trytond.modules.stock import StockMixin
 from trytond.i18n import gettext
 from trytond.exceptions import UserError
-from trytond.pyson import Eval
 
 
 class Party(StockMixin, metaclass=PoolMeta):
@@ -64,34 +63,6 @@ class Location(metaclass=PoolMeta):
         return grouping, key
 
 
-class Lot(metaclass=PoolMeta):
-    __name__ = 'stock.lot'
-
-    @classmethod
-    def _get_quantity(cls, records, name, location_ids,
-            grouping=('product',), grouping_filter=None, position=-1):
-        if 'party' in Transaction().context:
-            party_id = Transaction().context.get('party')
-            grouping = grouping + ('party',)
-            grouping_filter = grouping_filter + ([], [party_id],)
-            # Must use position = -2 because we want to get the quantity from the
-            # lot key, not the party
-            position = -2
-        with Transaction().set_context(exclude_party_quantities=True):
-            return super()._get_quantity(records, name, location_ids, grouping,
-                grouping_filter, position)
-
-    #@classmethod
-    #def _search_quantity(cls, name, location_ids, domain=None,
-            #grouping=('product',), position=-1):
-        #party_id = Transaction().context.get('party')
-        #if party_id:
-            #grouping = grouping + ('party',)
-            #position = -2
-        #return super()._search_quantity(name, location_ids, domain, grouping,
-            #position)
-
-
 class Move(metaclass=PoolMeta):
     __name__ = 'stock.move'
     party = fields.Many2One('party.party', 'Party')
@@ -102,13 +73,6 @@ class Move(metaclass=PoolMeta):
     party_to_check = fields.Function(fields.Many2One('party.party', 'Party'),
         'get_party_to_check')
 
-    @classmethod
-    def __setup__(cls):
-        super().__setup__()
-        if hasattr(cls, 'lot'):
-            cls.lot.context['party'] = Eval('party_used', 0)
-            cls.lot.depends.append('party_used')
-
 
     @fields.depends('party')
     def on_change_with_party_used(self, name=None):