use mkDefault on root's shell
twinkle: fix build (fixes #3673)

Pulled patches from Debian and hacked around linking errors.
I'm able to ring my mobile phone now.
However, on exit the process is stuck and needs kill -9.

CC: maintainer @MarcWeber.
Merge pull request #3696 from matejc/root_default_shell

use mkDefault on root's shell
rhash: new package

Console utility for computing and verifying hash sums of files

http://rhash.anz.ru
Merge remote-tracking branch 'upstream/master'