[bitfolk] Updated rescue environment available for testing

Hi, The current BitFolk rescue VM as described in <https://tools.bitfolk.com/wiki/Rescue> is based on Debian wheezy (7.0) and as such is starting to get too old to be useful. I've set up a newer one based on Debian stretch (9.0), which can be accessed by using the "rescue-dev" command (instead of just "rescue"). Next time you have cause to use the rescue environment, if you could give "rescue-dev" a go and let me know of any issues, that would be helpful. It should work just the same, except for being newer. Cheers, Andy -- https://bitfolk.com/ -- No-nonsense VPS hosting