[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
[FIX] [CLEAN] Various: fixed / cleaned use of dict.fromkeys.

Indeed using fromkeys with a list / dict as argument leads to the creation
of shared list / dict. This could create some ugly side effects when
used in loops. This commit fixes or cleans this kind of statement to avoid
unwanted side effects.
[FIX] Package: Debian: finally a correct Packages generation
[I18N] Update translations from Launchpad branches
[FIX] update autocomplete test

Autocompletion of many2one fields only accepts domains in the form of
arrays, not as strings.
[FIX] Package: split the version to not include the latest commit's hash included by the package script
[FIX] stock_account: accept negative quantities on standard price

The qty_available available of a product can be negative (e.g. using the force availibility button on delivery order) and the generated account.move.line should be adapted (otherwise getting negative values in debit/credit entries).
Fixes #2475
[REL] Odoo 8.0
[FIX] survey: display_mode is required if question type is simple_choice

Fixes #2461
[FIX] survey: typo in domain
[FIX] mrp_repair: pass context in product_id_change calls
[FIX] kanban: wrong condition to reset the dataset index

The dataset index should be reset either if the dataset is empty or the index is greater than the records size
[MERGE] forward port of branch 7.0 up to a218a9e
[MERGE] forward port of branch saas-3 up to 5bd0249
[FIX] event: translate templates into user language

When sending an email of the registration/confirmation, the context was lost and the tempate sticked in en_US.
With the patch, the template will use the current user's language.
[FIX] website_sale: displayed price doesn't change for 'List View of Variants' customize template
[FIX] Packaging: Wndows: wrong handler used when logging to file