operations: make --immutable work with copyto, moveto and single file copy - fixes #4921

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--immutable was only enforced by sync, so copyto, moveto, copy and move
of a single file, and the operations/copyfile and operations/movefile rc
calls overwrote a destination which differed from the source.

Fail these with the same ErrorImmutableModified as sync, and reject
--no-check-dest with --immutable as sync does, since without checking
the destination it cannot be protected.

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