Remove Gargantext.Utils.Seq: if we need it, it should be one directly implemented using the underlying tree

Use thisModule everywhere.

Turns out caches.delete() didn't return a promise.

Also small improvements to Ngrams get (use ngrams get all endpoint).

Changed contacts, rename node, corpus code file name to use input field
where enter confirms the edition.

In Home/Public error was thrown: <div> cannot be nested under <p>.

Now focus works.

This could be more performant than Array. We don't do random access,
only filtering.

Now focus works.

This could be more performant than Array. We don't do random access,
only filtering.