Change interfaces to work with larger data (required when merging long-dict-id branch to devel) about hdt-cpp

[wouterbeek]

For @JanWielemaker and me it would be easier to have these changes into the development branch.

I will be using LOD-a-lot intensively over the coming month or so, so I can contribute in bug hunting / testing the development branch.

[JanWielemaker]

@wouterbeek Is fine with a branch too. It just implies creating a branch in the Prolog interface and moving the hdt-lib submodule to a branch. No problem.

[wouterbeek]

@JanWielemaker Oops, I stand corrected!

[RubenVerborgh]

• happy with merging this into develop
• +1 for major version change, but careful: this should not change the HDT format version number
• Is the index file affected?

[RubenVerborgh]

Ah, and of course on the condition that the CI works (fails now on head of long-dict-id ).

[MarioAriasGa]

The HDT format stays the same (including the index), but can potentially break compilations of software compiling against the library. The main change is using size_t for dictionary ids all around the place.

[RubenVerborgh]

Fine with me; please create a pull request for a rebased long-dict-id.