This date.range.type in v11 have benn used in some cases. Then, when you migrate, you need to have this data or else delete its xmlid.
We think it's better to keep it, because you may want to still use it.
* Add contributors to README
* try to find a FY start date according to the start date from choosen period
* Unable to unlink a date_range with type fiscal_year
* `fiscal_year` flag readonly
* add menu to date_range under accounting section
* remove method on object because it's the same as in file
* unable to delete with flag 'fiscal_year' but can delete
* clean __openerp__.py
* account_fiscal_year version number
