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We now explicitly use a file opened in bytes mode to produce the stream
for LCSV and SKOS data import. Similarly, when using an in-memory
object, we use a BytesIO. This does not change anything in python2, but
this is required to keep things working on python3.

Closes #17133722.

not sure it has passed once :/

Code adapted and backported from the SEDA cube.

Closes #14170765

[schema] Unify all `*_label_of` relations into a `label_of` relation and add a "kind" attribute to Label

Also, rename pref_label and alt_label computed relations to preferred_label and
alternative_label. This is more consistent and eases some bits of code.

As a consequence, always display the tab even if empty (otherwise one would
not see the import link).

Also make the `delimiter` parameter mandatory in `add_concepts_from_file`
method.

closes #3121346

Also extract a build_result_dict() from add_concepts_from_file() on the way, since this code is used
everywhere

closes #2892966

ex :

Concept

\\tSub-concept

Fellow-concept

Separators may be configured.