* Refactor List in Pointer DB
* Fix pointerdb-client example
* Fix issue in Path type related to empty paths
* Test for the PointerDB service with some fixes
* Fixed debug message in example: trancated --> more
* GoDoc comments for unexported methods
* TODO comment to check if Put is overwriting
* Log warning if protobuf timestamp cannot be converted
* TODO comment to make ListPageLimit configurable
* Rename 'segment' package to 'segments' to reflect folder name
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