Removed was_destroyed_ field from buf_lock_t.
Made buf_read_t::get_data_read() guarantee the block size is the max possible.
Removed RSI comment about buf_read_t::get_data_read.
Remove RSI claiming that we should rename get_recency.
Removed get_block_id function.
Resolved RSI about bad buf_lock_t constructor documentation.
Moved alt_snapshot_node_t to alt.cc.
Adjusted a comment -- read transactions _should_ use preceding_txn.