This commit tries to refactore the management of contexts and domains
in the webclient.
- Get rid of CompoundDomain: use standard array manipulation to
join multiple domains or use the Domain class (to be improved)
- Get rid of data.js build_domain and build_context methods
- Link this.record to the data point from the basic model for all
fields (not only relational fields)
- Add a getContext and a getDomain function to the basic model
data point (localData element) so that AbstractField implementations
can use them thanks to their this.record element.
- Remove the autocontext binding for field RPCs (see FieldManagerMixin)