[Trunk] rounding issue with account taxes

Related to the fix introduced following that bug
https://bugs.launchpad.net/openobject-addons/+bug/882036

the new rounding method created in the server should be used in the addons.

For instance, the rounding of the tax is performed in the account module with the python round method. The float_round method should be used in order to properly compute the taxes.

=== modified file 'account/account.py'
--- account/account.py 2012-03-22 12:24:19 +0000
+++ account/account.py 2012-07-17 11:17:12 +0000
@@ -29,6 +29,7 @@
 from osv import fields, osv
 import decimal_precision as dp
 from tools.translate import _
+from tools import float_round as round

 def check_cycle(self, cr, uid, ids, context=None):
     """ climbs the ``self._table.parent_id`` chains for 100 levels or

=== modified file 'account/account_bank_statement.py'
--- account/account_bank_statement.py 2012-03-22 11:39:59 +0000
+++ account/account_bank_statement.py 2012-07-17 11:23:22 +0000
@@ -24,6 +24,7 @@
 from osv import fields, osv
 from tools.translate import _
 import decimal_precision as dp
+from tools import float_round as round

 class account_bank_statement(osv.osv):