Code review comment for lp:~akretion-team/banking-addons/account_statement_base_import_conversion_dict

I approve this merge.
Note the key "extra_fields" have been introduced here : http://bazaar.launchpad.net/~banking-addons-team/banking-addons/bank-statement-reconcile-70/revision/94#account_statement_base_import/parser/file_parser.py
I thinks it's better to come back with the convertion_dict because the FileParser is an abstract Parser for file, and can be reuse in many case (Paypal, Atos, Paybox...). So the convert dict depend of the implementation of the Parser and can not be generic