Changes from Toru Tsuneyoshi for using Trash can when deleting files.
* files.el (backup-extract-version): Handle versioned directories. (trash-directory): New variable. (move-file-to-trash): New function. * cus-start.el (delete-by-moving-to-trash): Declare for custom. * lisp.h (Qdelete_file, Qdelete_directory): Declare extern. * fileio.c (delete_by_moving_to_trash, Qmove_file_to_trash): New vars. (syms_of_fileio): Initialize and export them. (Fdelete_directory, Fdelete_file): Optionally delete via trash. * w32fns.c (FOF_NO_CONNECTED_ELEMENTS): Define if not already. (Fsystem_move_file_to_trash): New function. (syms_of_w32fns): Export it to lisp.
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