str2color now generates 256 colors

* function enhancement 'borrowed' from
  https://github.com/hacosta/configfiles/commit/b4adb05cab8d22b9e174d458cd59a219897198d7
Bash Hostname tab completion for ssh and scp

* Host completion for ssh and scp for non archlinux machines (arch linux
  handles this already )
Root's prompts last character to '#'

* Changed root's last character form $ to # to be consistent with
  default configuration