Pyuftp

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- fix: key-based authentication with password did not work correctly
(leading to a 403 error)
- fix: "cp -D ..." led to errors
- improvement: 'Ä'issue-token': show asserted uid, if any

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- fix: requirements.txt was missing in distribution

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- fix: "ls" output had wrong modification times

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- first complete version including the following commands:
auth, checksum, cp, find, info, issue-token, ls, mkdir, rcp, rm, share
- supports username/password, token, oidc-agent and sshkey authentication
- supports multi-stream, encrypted and compressed transfers
- uses the same command-line syntax, options etc as the Java client