Introduce two notions of liveness.

One notion for IL/I and one for IL/F,
IL/F liveness implies IL/I liveness.
Update DVE proofs accordingly.
Coherence proof works for either definition.
Add Coh_I and preservation.
Fix Delocation for liveness.
Fix Allocation.v for liveness.
More fixes for liveness and a simplification.
Fix extraction.
Simplify delocation algo.
Add trace equivalence proof.
Add description of the acronym LVC.