Several improvements and fixes of Lia

- Improved reification for Micromega (support for #8764)

- Fixes #9268: Do not take universes into account in lia reification

  Improve #9291 by threading the evar_map during reification.
  Universes are unified.

- Remove (potentially cyclic) dependency over lra for Rle_abs

- Towards a complete simplex-based lia

  fixes  #9615

Lia is now exclusively using cutting plane proofs.
For this to always work, all the variables need to be positive.
Therefore, lia is pre-processing the goal  for each variable x
it introduces the constraints x = y - z , y>=0 , z >= 0
for some fresh variable y and z.

For scalability, nia is currently NOT performing this pre-processing.

- Lia is using the FSet library

  manual merge of commit #230899e87c51c12b2f21b6fedc414d099a1425e4
  to work around a "leaked" hint breaking compatibility of eauto

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