Changed method to allow having readonly in a view on analytic dimensions placeholder so that all analytic fields will get readonly too.

The new feature makes it possible to create analytic codes for historical
data from the web interface.

- Few small easy mistake fix (typo)
- Define _bound_dimension_id in _setup_complete method instead of __init__

The method calls get_object_reference or _update try to look up information
in the _columns of the object. But at '__init__' time, the object is not properly
finish and _columns is None.
By moving last initialisation in _setup_complete we are sure that object is initialized.

We need to keep the old api to be sure that 'self' is really the object.
If v8 api 'self' is a records set and we can't set _bound_dimension_id.

Main changes are :
- Change fields declaration
- Update metaclass to add field to nmspc instead of _columns
- Add v8's version of compute/reverse/search function of
    disable_per_company field