[FIX] res.partner: autosync of commercial fields and address fields + correct views accordingly + basic tests

* Commercial fields (bug 1160365)

Fix autosync of accounting/invoicing-related fields on contacts,
just as if they were actually modeled as fields.related to the
parent commercial entity.
This starts with the addition of the new functional field
`commercial_id`, to locate the commercial entity for any partner.
The commercial entity is defined as the first ancestor (starting
at the partner itself) that is either marked `is_company` or has
no parent. [This is Part A of the solution on bug 1160365].

Then, whenever a partner is created or modified:
- if it is a commercial entity, the commercial fields are synced
downstream to all its descendants, stopping at company boundaries.
- if is is not a commercial entity, the commercial fields are
synced from its parent commercial entity.
The list of fields to sync is determined by calling the new
res.partner method `_commercial_fields()` which can be easily
extended by any module that adds commercial fields on res.partner.
A utility method `open_commercial_entity()` was added to
res.partner to make it easy to include a button for editing the
parent commercial entity, to be displayed instead of now-hidden
commercial fields.
[This is part B of the solution on bug 1160365]

The res.partner.address_get() method (used to find child partners
of certain types, e.g. "invoice") was udpated to take the new
"commercial entity" notion into account: it will now look for
matches in children but also parents and siblings that are part
of the same "commercial entity". The default partner `type` is
now "contact" to reflect the new model ; "default" is
inappropriate because it is a wildcard and would stop the type
lookup early.
[This composes parts C and D of the solution on bug 1160365]

Note: This fix comes with a matching addons fix to implement
module-specific extensions of part B, as well as part E of the
solution.


* Address fields (bug 1160425)

Corrected autosync of address fields is also included in the
same branch, because those two mechanisms are closely related
and share some parts of the implementation.

The `use_parent_address` field now defaults to False (except
in the mini-kanban view of contacts on a partner form), and
the autosync of address fields has been modified to only work
downstream and never update a parent company if a child contact
is modified. Instead, the address fields are now displayed
readonly on contacts that use the parent address, with a button
to edit the parent address (new method open_parent(), similar
to open_commercial_entity() but opening the direct parent).

To make the initial creation of a contact + company pair,
a special case was added: when a new contact is created for
a company that has no other contact and no address, the
address of the contact is assumed to be that of the company
so it is moved to the company, then the `use_parent_address`
flag is enabled on the contact, and the `is_company` flag on
the company. This covers a use case where contact and
company are created on-the-fly when creating a new document.

Many logical flaws in the autosync of address fields have been
corrected and are now covered by unit tests.


* Misc related fixes

- checking `is_company` does not reset the parent_id field
anymore, to allow for multi-level structures. The field is
still hidden automatically because having an empty "Company"
field on the form view of a company is quite suprising), but
this UI behavior is easily customized;
- the `email`, `phone`, `fax`, `mobile`, `lang`, etc. that
were sometimes synced when changing parent company are now
properly left alone;
- the `use_parent_address` field is now always visible next
to the parent_id field when a parent is set

lp bug: https://launchpad.net/bugs/1160425 fixed
lp bug: https://launchpad.net/bugs/1160365 fixed

bzr revid: odo@openerp.com-20130408013742-tm8w0w0nmunanokk

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