[ADD] port security reference doc
[ADD] openerp.http reference doc

* fix some docstrings so they can be autodoc'd
* intersphinx mapping (and links to) werkzeug and python
[ADD] web client tutorial/training

needs fixes, and corresponding web client reference
[FIX] http.py: session id is `sid` attribute
fix typo on undeclared variable xml_id
Merge pull request #2113 from yvaucher/8.0-fix-ir_model-undefined-xml_id

fix typo on undeclared variable xml_id
[FIX] crm: lead_to_opportunities, check that current active_id has not been already merged by another previous active_id. Else, we was trying to browse an lead which was already deleted by a previous merge in the same loop.
[FIX] account, bank statement reconciliation: payment and invoice in foreign currency use case fixed
[FIX] l10n_be_coda: if there's no communication, feed the field with '/' instead of an empty string
[FIX] website_sale: pay now button should be translatable
[FIX] survey: trace the partner_id taking the survey; if no token, set as the current user's partner.