There shouldn't be any "*" when entering a password or passphrase for
better security. Linux/Unix openssh works the same way - without any
"*". Great suggestion by Mark Hahnel in comments of Issue #5
ssh.exe client invoked underneath was not able to send password prompt
and read password from user as stdin and stdout handles were redirected
to sockets by sftp.exe ; stderr which is not redirected is used to show
prompt to users and data is read from console