Merge branch 'ralf/no-eta' into 'master'

theories/algebra/ofe.v

theories/base_logic/lib/fancy_updates.v

theories/base_logic/lib/gen_heap.v

theories/base_logic/lib/invariants.v

theories/base_logic/lib/own.v

theories/base_logic/upred.v

theories/bi/big_op.v

theories/bi/lib/atomic.v

theories/bi/monpred.v

theories/program_logic/total_weakestpre.v

theories/program_logic/weakestpre.v

theories/proofmode/environments.v