Encode the location/length of simple values in the WT_ROW pointer, along
with the key.
Merge branch 'develop' into encode-key-and-value
Simplify the row-store internal search loop: start at slot 1 so we don't
need to test to avoid a comparison against slot 0 inside the loop, jump
past the set of child when we find an exact match to avoid an unnecessary
comparison against the last comparison value.
Merge pull request #1109 from wiredtiger/internal-page-skip-0th

Simplify the row-store internal search loop
Merge pull request #1103 from wiredtiger/encode-key-and-value

Keep on-page key/value offsets and lengths in the index array pointer when possible.