Construct an "address" and read the block through the btree I/O
functions (so the block is decompressed as necessary).
No reason to call the __wt_multi_to_ref() page argument "orig", it's not
an "original" anything.
No reason to call the __wt_multi_to_ref() page argument "orig", it's not
an "original" anything.
Raw compression wasn't setting the next boundary buffer's key, resulting
in skipped updates going to the wrong page.

Reference #984, #991.
WT_RET where a WT_ERR was required.