[ADD] payment_acquirer: in the rendering, now supported in the context :
- tx_url: the form action URL, that can be set by the context, otherwise fall back on the acquirer default tx URL
- submit_class and submit_txt: submit is now a button with an image, unless asked not to; used in the ecommerce to display a Pay Now button instead of the acquirer logo
- updated all acquirers accordingly.
[IMP] payment_acquirer: cleaned and improved form view, for acquirer and tx models.
[IMP] payment_acquirer: amount and fees are now (16,2) float fields. Updated code to handle this kind of floats. Probably those values should come from some config parameters, but it is still not the case.
[CLEAN] various acquirers: removed unnecessary fields, among other the fields holding URLs. URLs of an acquirer should be accessible through a method, but storing them in a field is wasted space. Updated all acquirers and code accordingly.
[FIX] various acquirers: fixed ckeckout and getting data back processes. Some fixed in the controllers, some fixes in the data management due to prior refactoring and improvements in website and acquirer model.
[IMP] website_sale: updated the choice of the acquirer. They are all displayed with a small image as radio input; a Pay Now button is present to activate the payment process. Actually each acquirer generated a Pay Now button, but only the one of the chosen acquirer is displayed. This rendering uses the new options added in the button rendering process described hereabove.
[REM] website_payment: removed most of the code that was present for testing purposes. Only some JS is kept, for future credit-card form rendering.
bzr revid: tde@openerp.com-20131204175715-gdbl0tp5vbnc6pxm
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