Don't allocate a ptty on remote end

I find opening a pseudo-TTY to be a reliable way to keep a long-running SSH tunnel open on some SSH servers -- more reliable than keep-alives. For this reason, I consider -t to be a good default for this program.

I will consider adding a hidden config option to allow the user to modify the default tunnel arguments. This will allow you to change -t to -T if you desire, while not exposing this "expert" level option to regular users for whom the current default command line is working just fine.

Hopefully I'll be able to get to this in a couple of weeks time.

If enough other people indicate that they would prefer -T to be the default, then I will consider making that the default and override it locally for my own use.

Revision 73 adds a new hidden configuration variable for advanced users. Add the following to your ~/.TunnelManager/properties.conf:

[BASE]
sshbaseargs = ['-N', '-T', '-x', '-o', 'ExitOnForwardFailure=yes']

This will change the '-t' to '-T' when executing ssh. If you prefer this to be server specific, remove '-t' from the list entirely and add server specific settings to your ~/.ssh/config file.