New scripts and modifications:

- new file:   Sed_ssh.pl: Delete line in .ssh/known_hosts
- modified:   SegurGeneratech.pl: Change how to test if we have a ssh
  connection, from netcat to ssh
- new file:   Vimdiff.pl: Differences between files in different hosts
- new file:   Vimdiff_Generatech.pl:  Differences between file and
  generatech.