* First draft: pass the parent block header to on_close_block * typos and cleanup * whitespace * Store parent in ClosedBlock as well so it can be reopen()'d * Don't pass parent when reopening a block * Remove the unused ancestry param
* First draft: pass the parent block header to on_close_block * typos and cleanup * whitespace * Store parent in ClosedBlock as well so it can be reopen()'d * Don't pass parent when reopening a block * Remove the unused ancestry param