pack no longer re-encodes profitable deltas and answers immediately on an unchanged store -- which also means a no-op pack checks no integrity, so the reference now says verify is the pass that always reads everything. stat reports the user table; verify's untouched-row list includes user rows. caching.html gains the treestat and packed memos, and the log-scan index tier says what it actually carries now. check-in: 87b58a3943 user: dmestas tags: trunk