- audit fatal error handling, currently fatal errors can dissapear
  under best_effort and other similar conditions

- port to OpenVMS

- add support for later protocol versions

- add support for encodings

- add support for process filters on put/get operations

- implement save_status methods as a wrapper like best_effort

- reimplement autodie in a saner way

- allow per-method enabling/disabling autodie


- add support for capture_stderr option in constructor

- add support for new extension methods available from late OpenSSH
  SFTP server (

- add support for unix2dos and dos2unix transformations on the fly for get and put.

- add support for restarting transfers in put, get and derived methods.

- improve password login, remove Expect dependency and try to backport
  as much as possible fron Net::OpenSSH

- detect unknown host key checking

- make setstat failures optionally non fatal inside put method