Bank statement base completion

 The goal of this module is to improve the basic bank statement, help dealing
 with huge volume of reconciliation by providing basic rules to identify the
 partner of a bank statement line.
 Each bank statement profile can have its own rules to be applied according to
 a sequence order.

 Some basic rules are provided in this module:

 1) Match from statement line label (based on partner field 'Bank Statement
    Label')
 2) Match from statement line label (based on partner name)
 3) Match from statement line reference (based on Invoice number)

 You can easily override this module and add your own rules in your own one.
 The basic rules only fill in  the partner, but you can use them to fill in
 any value of the line (in the future, we will add a rule to automatically
 match and reconcile the line).

 It adds as well a label on the bank statement line (on which the pre-define
 rules can match) and a char field on the partner called 'Bank Statement
 Label'.  Using the pre-define rules, you will be able to match various
 labels for a partner.

 The reference of the line is always used by the reconciliation process. We're
 supposed to copy there (or write manually) the matching string. This can be:
 the order Number or an invoice number, or anything that will be found in the
 invoice accounting entry part to make the match.

 You can use it with  our account_advanced_reconcile module to automatize the
 reconciliation process.


 TODO: The rules that look for invoices to find out the partner should take
 back the payable / receivable account from there directly instead of
 retrieving it from partner properties!