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fix imap_seq and imap_seq0 to make them useful

See merge request !151

Create HintDBs with the discriminated option

See merge request iris/stdpp!148

Added select and select_revert tactics

See merge request !142

According to the documentation
https://coq.inria.fr/distrib/current/refman/proof-engine/tactics.html#coq:cmd.create-hintdb,
when creating a hint database without discrimination, Coq uses the
legacy implementation, which only uses Discrimination Trees for goals
without evars and does not use opaqueness information. This commit
switches the hint databases of stdpp to the new implementation.

Add filter_app lemma

See merge request !147

Add `ProofIrrel ()`

See merge request !146

This instance might seem odd, but `ProofIrrel` takes a `Type` and not a `Prop`,
and stdpp already has instances for products.

Extracted list_numbers.v with seq, seqZ, sum_list and max_list

See merge request iris/stdpp!141

Add `encode_Z` function to encode element of countable type as `Z`.

See merge request !145

Another try at removing strings.length

See merge request !144

Add tests for equiv notation

See merge request iris/stdpp!143

Extracted from iris!409.

Add notation `wn` of weakly normalizing terms; and prove some common theorems about it.

See merge request !140

Revise uses of inj as discussed

See merge request !138

Code not affected by a00d9bd8.

All occurrences are gone, except for one in `base.v` where you'd need different
functions.

However, I'm unsure this is an improvement: in lots of cases here, the function
didn't need to be guessed, but could be deduced by "simple" higher-order
unification, the one where unifying `?f ?a` against `g args last_arg` sets `?f =
g args`.

Code affected by a00d9bd8.

Rename `fin_maps.singleton_proper` into `singletonM_proper`.

See merge request !137

add sed script for 1.3.0

See merge request iris/stdpp!128