[account_financial_report] adds the following features to Trial Balance:

- Adds 'Period balance' column
- Renames the option 'Hide accounts at 0'. Means no initial, no debit, credit
  or ending balance for the period.
- Fixes logic to remove lines with 0 activity for the period.
- improve the calculation in the Trial Balance
  of undistributed profits/losses account, and provide a footer note
  to the user explaining why will the ending balances will not be zero, but the
  period's total profit and loss.
- add an extra line for P&L application so that the trial balance zeroes in the
  balance, and total debits = total credits
- refactoring of the unaffected earnings reporting in the general ledger
  and trial balance.

account_financial_report/wizard/trial_balance_wizard.py

@@ -31,21 +31,28 @@ class TrialBalanceReportWizard(models.TransientModel):
                                    string='Target Moves',
                                    required=True,
                                    default='all')
-    hierarchy_on = fields.Selection([('computed', 'Computed Accounts'),
-                                     ('relation', 'Child Accounts')],
-                                    string='Hierarchy On',
-                                    required=True,
-                                    default='computed')
+    hierarchy_on = fields.Selection(
+        [('computed', 'Computed Accounts'),
+         ('relation', 'Child Accounts'),
+         ('none', 'No hierarchy')],
+        string='Hierarchy On',
+        required=True,
+        default='computed',
+        help="""Computed Accounts: Use when the account group have codes
+        that represent prefixes of the actual accounts.\n
+        Child Accounts: Use when your account groups are hierarchical.\n
+        No hierarchy: Use to display just the accounts, without any grouping.
+        """,
+    )
     account_ids = fields.Many2many(
         comodel_name='account.account',
         string='Filter accounts',
     )
-    hide_account_balance_at_0 = fields.Boolean(
-        string='Hide account ending balance at 0',
-        help='Use this filter to hide an account or a partner '
-             'with an ending balance at 0. '
-             'If partners are filtered, '
-             'debits and credits totals will not match the trial balance.'
+    hide_account_at_0 = fields.Boolean(
+        string='Hide accounts at 0', default=True,
+        help='When this option is enabled, the trial balance will '
+             'not display accounts that have initial balance = '
+             'debit = credit = end balance = 0',
     )
     receivable_accounts_only = fields.Boolean()
     payable_accounts_only = fields.Boolean()
@@ -114,10 +121,8 @@ class TrialBalanceReportWizard(models.TransientModel):
         """Handle partners change."""
         if self.show_partner_details:
             self.receivable_accounts_only = self.payable_accounts_only = True
-            self.hide_account_balance_at_0 = True
         else:
             self.receivable_accounts_only = self.payable_accounts_only = False
-            self.hide_account_balance_at_0 = False
 
     @api.multi
     def button_export_html(self):
@@ -155,7 +160,7 @@ class TrialBalanceReportWizard(models.TransientModel):
             'date_from': self.date_from,
             'date_to': self.date_to,
             'only_posted_moves': self.target_move == 'posted',
-            'hide_account_balance_at_0': self.hide_account_balance_at_0,
+            'hide_account_at_0': self.hide_account_at_0,
             'foreign_currency': self.foreign_currency,
             'company_id': self.company_id.id,
             'filter_account_ids': [(6, 0, self.account_ids.ids)],

account_financial_report/wizard/trial_balance_wizard_view.xml

@@ -20,7 +20,7 @@
                         </group>
                         <group name="other_filters">
                             <field name="target_move" widget="radio"/>
-                            <field name="hide_account_balance_at_0"/>
+                            <field name="hide_account_at_0"/>
                             <field name="show_partner_details"/>
                             <field name="hierarchy_on" widget="radio" attrs="{'invisible':[('show_partner_details','=',True)]}"/>
                             <field name="foreign_currency"/>