Term Update

[ejohnstown]

1. Change GetTerminalSize() to GetTerminalInfo().
2. Add the term variable to the things GetTerminalInfo() looks up.
3. Return the actual value of the environment variable TERM to the server. If one isn't present, default to "xterm".
4. Clean up the whitespace in SendChannelTerminalRequest().

Misc other changes:

1. Cleanup whitespace in the recently added function SendChannelOpenFail().
2. Add labels to the parameters in the prototype for SendChannelOpenFail().
3. Remove the CR addition for Windows in the example client. Causes the enter key to double-strike.

Testing

% echo $TERM
% ./examples/client/client -u username -i ~/.ssh/id_ecdsa -j ~/.ssh/id_ecdsa.pub -p 22 -t -h server
% echo $TERM

The TERM values should match. Before the change, the server will always be told "xterm". On my system TERM is set to "screen-256color". The noticeable difference I had was with vim. Before the fix, vim would be in black-and-white. With the fix it is full color.