OAK-781: Clarify / fix effects of MISSING_NODE as base state of NodeBuilder
Introduce separate abstraction for tracking connectedness of builders

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1487084 13f79535-47bb-0310-9956-ffa450edef68
OAK-806: Content migration from Jackrabbit to Oak
missing dependency

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1487085 13f79535-47bb-0310-9956-ffa450edef68
OAK-781: Clarify / fix effects of MISSING_NODE as base state of NodeBuilder
- Inline read and write calls at their call sites
- Rename read, write and getNodeState methods to better reflect their semantics
- Improve Javadoc

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1487086 13f79535-47bb-0310-9956-ffa450edef68