simpler but perhaps less checks

Define properly stage0 and stage1

See merge request bobot/colibrics!6

       Push only allow to add at the end, not dequeue

       q.mlw proved only by colibri2_stage0

Use Why3 1.4 for extraction

See merge request bobot/colibrics!5

Headers and installation instructions.

See merge request bobot/colibrics!4

Fix quantifiers and propagation of equality in fourier

See merge request bobot/colibrics!3

Some extensions

See merge request bobot/colibrics!2

  allows to do the twowatchliteral during enqueue

Two watch literal not needed, since the must be all set

Iterative deepening must limit the depth

See merge request bobot/colibrics!1

 And fix generation of ADT

    And check the model before sat

 Remains a todo with type substitution

    - Handle a little of floor and ceil as (- (floor (- x)))