TUI modifications

Signed-off-by: Tomas Hozza <thozza@gmail.com>
Simple changes in base classes

Signed-off-by: Tomas Hozza <thozza@gmail.com>
Added some more useful methods to GuiHelper

Signed-off-by: Tomas Hozza <thozza@gmail.com>
GUI: Main Window functionality improvements

Signed-off-by: Tomas Hozza <thozza@gmail.com>
GUI: Fix glade file path in Measurement Window

Signed-off-by: Tomas Hozza <thozza@gmail.com>