Merge commit '342b79a4' into gen_proofmode

opam

theories/algebra/big_op.v

theories/algebra/cmra.v

theories/algebra/dra.v

theories/base_logic/deprecated.v

theories/base_logic/double_negation.v

theories/base_logic/lib/fancy_updates.v

theories/base_logic/lib/namespaces.v

theories/base_logic/lib/viewshifts.v

theories/base_logic/upred.v

theories/bi/interface.v

theories/program_logic/hoare.v

theories/program_logic/weakestpre.v

theories/proofmode/notation.v