Port qucs-rescodes to Qt4

[guitorri]

Replace the headers and method that depend on Qt3Support.
Ex. Q3HBox -> QHBoxLayout...

[yodalee]

I use grep "Q3" -rI . in qucs directory, there is 1029 lines, hard work lol

[guitorri]

Well, this issue is only about qucs-rescodes:

~ $ grep --include={*.cpp,*.h} "Q3" -ri ~/git/qucs/qucs/qucs-rescodes/ | wc -l
      33

[yodalee]

I will handle this issue. BTW, I send a pull request about print by cmd line, you can try it and tell me how do you think about it.

[guitorri]

Sure. I was about to start looking at your PR. ;)