[IMP] fields: reset decimal precision on new-style fields

When a decimal_precision record is created/modified, the float fields of the
models in the registry must be reset.  This was done on old-API columns only.
It is now handled by the new-API fields.
[IMP] gamification: usability and shit

Challenge
- 'Reward as soon as every goal is reached' box checked by default (most of the time people want this behaviour, few special cases were do not)
- Click on challenge kanban opens goal list instead of challenge form
- Add button 'Start Challenge' clicking on statusbar is not intuitive

Badge
- When creates a challenge from badge view, set by default badge to 'For Every Succeding User' field
- replace filter 'Current' vs 'Passed' by 'Running' (in progress and done with not reached end date) vs 'Done' (done & failed without end date or end date passed)

Goal
- list of badge on employee form not the first tab
[ADD] base: list of inherited models on a ir.model

This field is needed to retrieve the list of inherited fields (instead of only the fields of a current model) of a model using domain such as ('model_id', 'in', model.inherited_model_ids) on ir.model.fields
[IMP] gamification: allow to select fields of inherited models