GitLab

  - define large-spacing variants of the logical connectives
  - rename \ISep to \isepV, improve its aspect
  - fix dirty spacing in various macros (avoid relative spacing such as \, or \!)
  - better use of mathpar

Get rid of existential quantifier in invariant-opening rule of logically atomic triples. This matches what is stated in the Iris 1 paper, and is actually not less expressive.

reorganize sections: put reminder of syntax just before description of code, lift queue.{spec,impl,proof} up by 1 level