refactoring, debugging, EU::XSpp version

    * refactoring typemaps
    * switched to PPCODE for some of the methods to be able to add
      debug information
    * removed perlobject.map
    * did a lot memory leak testing with valgrind, it seems
      TskFsDir::getFile allocates memory, and TskFsFile::~TskFsFile
      doesn't let go of some of it. See xspp-version/isolated.cpp
      for details
      (the above two methods belong to the Tsk C++ interface)
    * added experimental ExtUtils::XSpp version of the bindings.