Add progress bit to wp (and slightly generalize wp_step, wp_safe).

naming.txt

theories/heap_lang/adequacy.v

theories/heap_lang/lifting.v

theories/heap_lang/proofmode.v

theories/program_logic/adequacy.v

theories/program_logic/ectx_lifting.v

theories/program_logic/hoare.v

theories/program_logic/language.v

theories/program_logic/lifting.v

theories/program_logic/ownp.v

theories/program_logic/weakestpre.v

theories/tests/barrier_client.v

theories/tests/heap_lang.v