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TODO
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fix openfile_windows.txt test. It seems that Windows 10 is better in handling
removed files. Adjust the test which is failing right now.

- use the same code for FSPathStorageBase.removeGhostFiles and GhostFiles.removeGhostFiles

- implement FSFileRemoveTransaction which is able to abort a remove transaction
  by revert isGhost status

- up test coverage to 100% or ditch unused code
