Commits
- e2116cd: Add split/merge readahead test (currently broken) (Vitaliy Filippov)
- d9d8a8f: Make BufferList::Dump return dump as a string (Vitaliy Filippov)
- 4bffd1b: Fix mergeRA() - fixes the newly added test (Vitaliy Filippov)
- e3adcd9: Move mergeRA and splitRA to buffer_list.go (Vitaliy Filippov)
- 163370b: Release 0.40.5 (Vitaliy Filippov)