Merge branch 'ralf/instance' into 'master'

Makefile.coq.local

iris/algebra/agree.v

iris/algebra/cmra.v

iris/algebra/cofe_solver.v

iris/algebra/csum.v

iris/algebra/dra.v

iris/algebra/excl.v

iris/algebra/ofe.v

iris/algebra/proofmode_classes.v

iris/algebra/sts.v

iris/base_logic/lib/iprop.v

iris/bi/derived_connectives.v

iris/bi/monpred.v

iris/program_logic/total_weakestpre.v

iris/program_logic/weakestpre.v

iris/proofmode/classes.v

iris/proofmode/coq_tactics.v

iris_heap_lang/lib/increment.v

iris_heap_lang/lib/lock.v

iris_heap_lang/locations.v