The device configuration widget is now the only place the user
ever has to specify ports.

Only tested on Linux, #ifdef'ed for now.

This makes us more independent of the developer PC's firewall setting.

Reviewed-by: kh1

Reviewed-by: kh1

1) Make sources available on device.
2) Enable users to switch between gdb and gdbserver approach (users may not be able to use the former if they have no control over their firewall).

Reviewed-by: kh1

Task-number: QTCREATORBUG-1951
Reviewed-by: kh1

Disabled on Windows for now due to utfs-server not working there.

Reviewed-by: kh1

Untested & unused.

Preparation for removing MaemoDebugRunControl.

Reviewed-by: kh1

Also introduced MaemoSshThread class to factor out common parts
of the runner and the deployer code.
The maemosshrunner files do not contain code anymore and will
be removed soon.

We now have two subclasses for deploying files and
running commands, respectively.

This will replace the current ssh-via-QProcess approach, which
has severe drawbacks.