Merge branch 'master_pvm_initial' #22

Job	Run time
validate (stf/accumulate)	1m 32s
validate (traces)	2m 6s
validate (stf/authorizations)	1m 32s
validate (stf/assurances)	1m 35s
validate (stf/history)	1m 27s
validate (stf/disputes)	1m 41s
validate (erasure)	1m 33s
validate (stf/statistics)	1m 32s
validate (codec)	1m 32s
validate (stf/safrole)	1m 42s
validate (stf/reports)	1m 43s
validate (stf/preimages)	1m 32s
	19m 27s

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