OAK-1804 TarMK compaction
 - merged to 1.0 branch



git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1599447 13f79535-47bb-0310-9956-ffa450edef68
OAK-1862 Checkpoints release method
 - backporting to branch 1.0



git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1599454 13f79535-47bb-0310-9956-ffa450edef68