subvertpy_wrapper: move methods in the relevant editors Files and directories can only be opened/deleted/closed from a DirectoryEditor, and deltas can only be applied on a FileEditor. Invariants could be made stronger by adding a third RevisionEditor class containing set_target_revision() and open_root() but this will probably not give interesting results.

include Makefile hgsubversion/help/*.rst
recursive-include tests *.py *.sh *.svndump *.txt