[IMP] Packaging: Debian, RedHat: No more superuser for odoo role

only create db
[FIX] website_instantclick: this lib create some bug because the odoo assets are loaded in the body and some event are binded more of one time. Change the js lib  because the xml can't be change in 8.0. TODO: move assets into the head and fix js files and remove this commit in master
[IMP] module/loading: do not try to load module graph when nothing to load

This simple optimization in load_marked_modules() avoids unnecessary calls to
load_module_graph().  This provides a small speedup, and avoids confusing log:
some module updates were making it look like the registry was loaded 5 times
instead of once.
[ADD] doc: setup documentation

* Odoo installation from packages or source
* Deployment instructions for production environments
* dbfilter

Add missing support for disabling xmlrpc(/http), useful for WSGI
deployments which require running cron-only Odoo instances.
[FIX] update README about the new documentation
[FIX] odoo.py setup use 8.0 instead of master
[FIX] product: find products of subcategories

When searching products for a specific category, display the products of the whole category subtree.
[FIX] website_mail: avoid error when message.body is empty
[FIX] point_of_sale: account selection for payments

Registered payment uses the partner receivable account. As this field is
a property field, it will select different accounts based on the user that
registers the payment (in multicompany).
Should use the company of selected journal instead of the one of the user.
[FIX] payment_buckaroo: dynamic lang & test params

test flag is set according to acquirer environment
lang is set according to partner language
Merge branch '8.0' of https://github.com/odoo/odoo into 8.0

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