[ADD] Module sale_cancel_picking 

OpenERP 7.0 Module to cancel a sale order and by the same time, the related out picking.
It seems because of this : 
<pre><code>
2014-11-26 09:59:19,669 23703 WARNING openerp_test openerp.osv.orm.browse_record.sale.order.line: Field 'can_command_at_delivery_date' does not exist in object 'browse_record(sale.order.line, 26)'

2014-11-26 09:59:19,669 23703 ERROR openerp_test openerp.tools.safe_eval: Cannot eval u'if not object.can_command_at_delivery_date():\n failed = True'

Traceback (most recent call last):

File "/home/travis/OCB-7.0/openerp/tools/safe_eval.py", line 287, in safe_eval

return eval(test_expr(expr, _SAFE_OPCODES, mode=mode), globals_dict, locals_dict)

File "", line 1, in <module>

File "/home/travis/OCB-7.0/openerp/osv/orm.py", line 505, in __getattr__

raise AttributeError(e)

AttributeError: "Field 'can_command_at_delivery_date' does not exist in object 'browse_record(sale.order.line, 26)'"
</code></pre>

I give it a look. And <code>can_command_at_delivery_date</code> is a method in sale_exception_nostock. So, should this module depend on this ?