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Linear invariant counterexample, and more cinv rules

Closes #132

See merge request iris/iris!368

Document CoqIDE Unicode binding configuration

Closes #269

See merge request iris/iris!347

Fixes #269.

Make `big_op{L,M}_gen_proper_2` stronger

See merge request iris/iris!363

another variant of the linear-inv counterexample, based on an accessor that gives back the token earlier

heap_lang/lifting.v: Don't run auto on hopeless goals

See merge request iris/iris!369

Those goals happen to be solvable by [done] as well, so use that.

I also dropped some inconsistent line breaks.

Added variant of big_sepL_lookup_acc which allows updating the value

See merge request iris/iris!365

Fix unexpected implicit binder warning

See merge request iris/iris!367

Coq master is stricter about checking for meaningless implicit binders;
see https://github.com/coq/coq/pull/10202.

Better handling of persistent results in `iDestruct`, `iPoseProof`, `iAssert` and friends

See merge request iris/iris!341

Make handling of `AddModal` in `tac_specialize_frame` consistent with that in `tac_specialize_assert`.

The result of `iSpecialize ("H" with "[H1 .. Hn]")` was always put in the
spatial context. This commit strenghtens this tactic by putting the result
in the intuitionistic context if the following conditions hold:

1. The hypothesis `H` is persistent.
2. All the hypotheses `H1 .. Hn` are intuitionistic (or similarly, in case
   `[-H1 .. Hn]` is used, if all remaining hypotheses are intuitionistic).
3. If the pattern `[> ..]` for adding a modality is not used.

Clarify use of Require

See merge request iris/iris!345

Disclaimer for STSs.

See merge request iris/iris!366

This version allows to relate structures over different types.