#1 \'append\' should use \'move\'

[Remi Chateauneu]

When appending input data which can be lost (For flushing an output container or reading from a pipeline), it should use 'move()' because the input data will not be read again. It would allow to use 'swap' and have less memory allocations. See 'append()'.

[Remi Chateauneu]

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Ideally, we could use swap and swap_ranges or copy and copy_ranges, this wrapped into move / move_ranges