pty and tty support was not enabled or working in the code. Without pty
support, ssh client was very non functional - e.g. openssh linux server
prompt would not come through. Now ssh client works much better in
interactive mode ( uses pty).
NoMachine did not finish coding child process ending detection logic.
Added the needed code so that child process handle is added to the
handles that WaitForMultipleObjects() waits for in nomachine select()
implementation in socket.c. Otherwise select() would be stuck in
read/write dectection even when the process of interest has exited.
Fixed sftp-server put verb not working. Tested from out sftp client and
linux fedora openssh 6.9p1 sftp clients in transferring small and large
files using both get and put verbs.
sftp-server.exe code modified to work in Windows as NoMachine never
finished it to work. I/O handling to work as a subsystem and
openssh7.1p1 sshbuf_new() buffer system code had to be used. sshd_config
file need location of sftp subsystem to be specified.
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
