rename head_step → base_step

See merge request iris/iris!1012

rename mapsto → pointsto

Closes #495

See merge request iris/iris!1013

Tweak lemmas for discrete and total `cmra_update`

See merge request iris/iris!1016

`cmra_discrete_updateP` → `cmra_discrete_total_updateP`; repurpose
existing lemmas for version with only `CmraDiscrete`.

Fixed iFrame under ∧ and ∨ taking forever to fail in the presence of evars

See merge request iris/iris!989

Adapt to https://github.com/coq/coq/pull/14928

See merge request iris/iris!1015

Followup for iris/iris!1011

See merge request iris/iris!1014

Now works with Coq master which prints version 8.19+alpha

make Z_local_update statement more intuitive

See merge request iris/iris!1010

add back the ability to skip reference file checks on some Coq versions

See merge request !1011

remove the ability to have per-version output files

generalize iso_cmra_mixin_restrict to a lemma that can also restrict the domain

See merge request iris/iris!970