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Snapshot will re-appear in iris-examples eventually

Marianna Rapoport authored Jul 23, 2018 and Ralf Jung committed Oct 05, 2018

- Removing admitted prophecy spec and making prophecy-related examples (coin-flip and atomic-pair-snapshot) work with the new prophecy support in heap_lang
- Adjusting heap_lang tactics for automation of substitution, closedness, etc. to support prophecy syntax
- Adding notation for prophecy syntax

Marianna Rapoport authored Jul 17, 2018 and Ralf Jung committed Oct 05, 2018

- Removing head of list of observations after each reduction step in definition of wp
- Adding support for observations to state_interp and world
- Applying Ralf's suggestions to previous commit (e.g. replacing /\ and -> with unicode characters)

Marianna Rapoport authored Jun 21, 2018 and Ralf Jung committed Oct 05, 2018

- Added my version of increment.v for practicing working with logically atomic triples
- Added implementation of coin-flip spec from Turon et al. (POPL'13) with an assumed spec for prophecy variables

This needed minor rearrangement.

All the `env` operations are prefixed `env_`, so this is more consistent.

Added a new lemma to allocate fragmented ownership in unital gmaps while updating the full ownership