The underlying file format just changed, note it in the upgrading document.
Clear pages from the LRU queue as soon as they are locked.  Threads getting pages to evict look inside the WT_PAGE structure before switching the WT_REF state, so it isn't safe to evict a page that is queued.
Merge pull request #536 from wiredtiger/lru-queue-clear

Clear pages from the LRU queue as soon as they are locked.
whitespace
Merge branch 'develop' into file-extend
imported patch madvise-alignment
When unloading the live checkpoint, discard any extended blocks so files
don't stay longer than they need to be.  This means we truncate file on
both "open" and "close", but that doesn't seem too awful.
Merge branch 'develop' into file-extend