* [FIX][web_m2x_options] Fix Qweb templates.
They were trying to replace non-existing elements, and this was being logged to console:
Can't find "a.oe_m2o_cm_button" when extending template FieldMany2One
Can't find "span.badge" when extending template FieldMany2ManyTag
* Raise version correctly.
* [FIX] Make many2many_tags tag deletion work again
* Correct replacement of event
Instead of overwriting all events from upstream widget, better just overwrite the one you need and inherit the rest.