Revert commit 613c590962

The concepte it's not completly correct:

"""
In taxes by invoice report, filter the invoices and credit note from
invoice related, not from invoice tax. To ensure the information showed
is related the global invoice amount not the specfic tax.
"""

Is better to group bu the invoice tax.

taxes_by_invoice/taxes_by_invoice.py

@@ -277,9 +277,9 @@ class TaxesByInvoiceReport(HTMLReport):
             domain += [('invoice.party', 'in', parties)],
 
         if data['tax_type'] == 'invoiced':
-            domain += [('invoice.untaxed_amount', '>=', 0)]
+            domain += [('base', '>=', 0)]
         elif data['tax_type'] == 'refunded':
-            domain += [('invoice.untaxed_amount', '<', 0)]
+            domain += [('base', '<', 0)]
 
         if data['taxes']:
             domain += [('tax', 'in', data.get('taxes', []))]