[FIX] purchase(_requisition): typo negociation -> negotiation
[FIX] web: force company_logo change on company change

In multi company environment, the company logo was not updated on company change in the user preferences
This disrupted the end user, as he might think the company change did not happen.
[FIX] web_graph: pass context to fields_get for translation

In graph views, fields from the pivot table were not translated in the user language
We pass the context, containing the user language, to fields_get in order to get the translation
This is also done by the search view, in search.js line 1978 at this rev.

opw-616713
[CHG] ws doc: set right section against a dark background
[FIX] doc: viewport meta missing
[IMP] ws doc: affix language switcher to page top
[FIX] fields.py: Many2one fields only put valid values in cache
[FIX] web: m2o search facet do no set `default_*` context key for "name_search" values
[FIX] fields.py: in many2one convert_to_cache, value can be int but long as well
[FIX] translate: lang detection fallback actually falls back

For instance, when a context was passed to a method, but no lang was defined in the context, it did not tried to fallback to other places where we could have find the user language.
[FIX] account: floating point comparisons in get_reconciliation_proposition
[FIX] enable --debug for non-xmlrpc contexts

fixes #3102
[IMP] account: account.statement.operation.template model
- better many2one ondelete strategies
- domain set on fields, not views
- added domain on analytic_account_id field
[FIX] Customers remove action domain customer=1 use the context default.

Closes #3902
[IMP] res: partner form replace widget selection by option no_create
[ADD] doc: debug flag
[IMP] wording and ordering of documentation index
Merge remote-tracking branch 'upstream/8.0' into 8.0