Impacted versions:
10.0
Steps to reproduce:
1. Create Customer Invoice and Validate
2. Make Payments on Payments screen and confirm
3. Open Manual Payments and Invocies and try to reconcile hitting CTRL-Enter for mass reconciliation

Current behavior:
Odoo server error raised with traceback
File "/home/odoo/runbot/extra/runbot/static/build/188623-10-0-347494/odoo/addons/account/models/account_move.py", line 729, in process_reconciliations
    self.process_reconciliation(datum['mv_line_ids'], datum['new_mv_line_dicts'])
TypeError: process_reconciliation() takes exactly 2 arguments (3 given)

Expected behavior:

Video/Screenshot link (optional):
![image](https://cloud.githubusercontent.com/assets/17149532/21532189/3596954a-cd4e-11e6-94fa-be2195bd9f7b.png)


addons/account/models/account_move.py
for move in self:
            partner = move.line_ids.mapped('partner_id')
            move.partner_id = partner.id if len(partner) == 1 else False
    name = fields.Char(string='Number', required=True, copy=False, default='/')
    ref = fields.Char(string='Reference', copy=False)
    date = fields.Date(required=True, states={'posted': [('readonly', True)]}, index=True, default=fields.Date.context_today)
    journal_id = fields.Many2one('account.journal', string='Journal', required=True, states={'posted': [('readonly', True)]}, default=_get_default_journal)
    currency_id = fields.Many2one('res.currency', compute='_compute_currency', store=True, string="Currency")
    state = fields.Selection([('draft', 'Unposted'), ('posted', 'Posted')], string='Status',
      required=True, readonly=True, copy=False, default='draft',
      help='All manually created new journal entries are usually in the status \'Unposted\', '
           'but you can set the option to skip that status on the related journal. '
           'In that case, they will behave as journal entries automatically created by the '
           'system on document validation (invoices, bank statements...) and will be created '
           'in \'Posted\' status.')
    line_ids = fields.One2many('account.move.line', 'move_id', string='Journal Items',
        states={'posted': [('readonly', True)]}, copy=True)
    partner_id = fields.Many2one('res.partner', compute='_compute_partner_id', string="Partner", store=True, readonly=True)
    amount = fields.Monetary(compute='_amount_compute', store=True)
    narration = fields.Text(string='Internal Note')
    company_id = fields.Many2one('res.company', related='journal_id.company_id', string='Company', store=True, readonly=True,
        default=lambda self: self.env.user.company_id)
    matched_percentage = fields.Float('Percentage Matched', compute='_compute_matched_percentage', digits=0, store=True, readonly=True, help="Technical field used in cash basis method")
    statement_line_id = fields.Many2one('account.bank.statement.line', index=True, string='Bank statement line reconciled with this entry', copy=False, readonly=True)
    
    dummy_account_id = fields.Many2one('account.account', related='line_ids.account_id', string='Account', store=False)
    @api.model
    def fields_view_get(self, view_id=None, view_type='form', toolbar=False, submenu=False):