Derive Clone for GptDisk & mannual(fully customed) add_partition & pub partitions field about gpt HOT 3 CLOSED

Hi, thanks for using gpt.

To start, please make sure you are using the latest version 4.0.0-rc.3 to which i will be referring.

You're right Clone was not implemented, it is now.
You might also find the GptDisk::with_disk_device useful since D does not need to be cloneable.

You can add partitions with any values you want.
For this you need to modify the entire partition table GptDisk::take_partitions.
Once you have updated the partitions you can set them again with GptDisk::update_partitions.

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Ok,thank you for your hard-working. I was using 3.1 before,I will switch to the latest.
I found a fn: method gpt::header::Header::write_backup
Write the backup header.
But there is currently no load_backup .

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There are two functions to read a header other than GptDisk.
gpt::header::read_header_from_arbitrary_device and gpt::header::read_header

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