Merged Toni Makela requested to merge pineappl into master

Reaction interface for PineAPPL, and installation of Rust and PineAPPL deps if required. Alternatively, a lightweight installation can be enabled in the install script to restrict to bare minimum dependencies by including precompiled files under "tools/pineappl", for Linux x86-64 with ldd > 2.17, to avoid full installation of Rust etc.

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