[pure-ftpd] Add Support for FTP HASH Command

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Hello!

Thanks for maintaining this Software. Really helpful for my current project.=


Currently it seems that the FTP HASH command is not supported in this implem=
entation. I see grat benefit in the HASH command, as on the one Side Data in=
tegrity can be checked and on the other Hand two files can be compared witho=
ut downloading first. Would be nice if this could be added to pure-ftpd. Do y=
ou see any chance to get this implemented?

Here some Documentation/Definition. https://tools.ietf.org/id/draft-bryan-ft=
p-hash-05.html

Jakob=

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