[FIX] web: missing backport of rev df3c6b750249

[FIX] web: do not try to close a destroyed dialog. trigger "closing" signal on close by top-right "X" button
[FIX] hr_expense: tax included computation

When a tax included has a several childs, the source line should not be duplicated for each tax.
Without the patch, the actual product price (without taxes) would be (total - tax amount) for the last tax only (and not the sum of each tax). (opw 609104)
[FIX] orm, read_group: read_group_fill_results handle no_leaf
Merge pull request #21 from odoo/7.0

7.0