- make delegate/undelegate events private
- remove $el before start
- make replaceElement private
- remove one _ from __render_and_insert... method
- update documentation
- remove make and improve make_descriptive (also, it is private)
- ...

... gives wrong values due to the timezone.

For instance, let's assume that the browser timezone of the user
is UTC+2, and the user types 10/09/2017 10:00:00 in a searchview
with a datetime field in its arch (i.e. which autocompletes on a
datatime field). Before this rev., the suggested value was
10/09/2017 12:00:00, i.e. the timezone offset was added to the
value.

opw 779832

Before this rev., it crashed when the user typed a date (actually,
the last character of a date) in the search view (e.g. in
Accounting > Customer Invoices).

Before this commit, the integer fields were not displayed in the autocompletion
dropdown.
This commit fixes a typo that broke the behaviour.

The RPC system was not completely satisfactory, we decided to prepare
the future and do it properly.  This commit introduces the new rpc
system, which replace the previous new one.  We now simply have a
method, this._rpc, which takes a dictionary of parameters.  The idea is
that depending on the parameters, it is able to add correct default
value when necessary.

For situations where we don't have the this._rpc method, we can use the
rpc.query method, which takes the same arguments, but directly calls
ajax.rpc instead of triggering up some events.

* board, google_spreadsheet

Commit 8e0c7ccc77f358601b0701536fcb33842ca324a6 got rid of the
CompoundDomain class but did not adapt the code correctly.

- Domains have to be concatened, not regrouped in a big array
- String domains have to be converted to array
- "OR" joining must normalize subdomains first (add explicit "AND"s)

The _rpc method is now the preferred method to do a rpc, so we need to
update all calls.