Clarify when applications have to keep key/value buffers valid.
style: u_int32_t -> uint32_t, TXN_FORCE_EVICT no longer used.
Overwrite pages when they're free'd, in diagnostic mode, hopefully that
will help catch subsequent use of evicted pages.
Fix a comment.
Don't set the 'Z' flag to MALLOC_OPTIONS (FreeBSD malloc configuration),
we want to get garbage memory back from the allocator.
Add a comment to clarify ordering.
Don't let snippets appear together, it looks terrible.
Remove another place where "overwrite" hadn't been updated.
Minor text shuffling (hopefully) for clarity, fix one error value.
Merge pull request #608 from wiredtiger/cursor-scoping

Cursor scoping
update
Don't set the 'Z' flag to MALLOC_OPTIONS (FreeBSD malloc configuration),
we want to get garbage memory back from the allocator.
Document WT_ITEM structures don't need to be cleared before use, and
quit clearing them in the test/format and test/bloom programs.