This commit improves the tokenization process, allowing users
to set the acquirer to save payment data never, always or letting
the customer decide (only implemented in ecommerce for now).
Support for tokenization is improved for Ogone and Authorize.net
This commits also factorizes advanced payment features support
(authorization, tokenization, fees computation) in a generic method
overriden by every provider to specifiy which features are supported.
This process can be used in views to hide/show fields depending on
feature support or in constraint checks.
Damien Bouvy
ffd527d027