My most recent patch.

* For now all the sftp stuff has been stripped, it will be added back
later. But, it has a long way to go and I think finishing scp first
is more important
* Did some better work with scp errors

libssh2 returns, or can return, a lot of error numbers. Not sure how
many are actually used. It also can return more specific error
strings. The problem is that curl_strerror() isn't based on the
connection, so this extended error information is not available.

Jim

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