wxWindows test

[Juha Helminen]

I played a bit more with wxWindows to see how it works -- dialogs can be 
made and buttons connected to events... This 
http://www.nic.fi/~juhe/ptopengui/files/ example do not make anything 
usefull -- you can load project file (.pto) and can check if it is correct.

I suppose that unix makefile works, it's not tested after last changes.

Next step is to use data structures and read images. Do you have ideas 
how to devide project/GUI so that it's easier to maintain?

Juha