[MERGE] supports_chks flag on repo formats & minor log tweak (brisbane)

[Vincent Ladeuil]

>>>>> "Ian" == Ian Clatworthy <ian.clatworthy at internode.on.net> writes:

    Ian> This removes another 3 files from the differences list.
    Ian> Only the guts left after this cherrypick lands.

BB:approve

I'll merge,

     Vincent