#157 Edit Diagram Properties, change trace, apply, result invalid

[Guilherme]

1) add a trace to a diagram
2) edit the diagram
3) add a second trace, remove the first
4) apply or ok
- issue, new trace shows as invalid
- edit diagram again, there is no trace on the list, there is a hidden, empty one.
- remove the empty an add the second again works.

[Guilherme]

Seems related to slotRestToTake

Comment this out in diagramdialog.cpp and the issue is gone. Need to find a proper fix.

connect(GraphInput, SIGNAL(textChanged(const QString&)), SLOT(slotResetToTake(const QString&)));

[Guilherme]

Fixed in https://github.com/Qucs/qucs/issues/24