[RFC][PATCH 15/22] JavaHL Ra API Implementation

[[[
    JavaHL: Separated logic for clearing java object cppAddr into its own
function as needed by the commit editor C++ objects that require the child
to clear the reference and parent to perform deletion

    [ in subversion/bindings/javahl/native ]

    * SVNBase.cpp, SVNBase.h
      (dispose, disconnectCppObject): Split logic for clearing cppAddr
value in the java object into its own function
]]]