Migrate from Q3 to Q4

Steps include:
Q3GroupBox->QGroupBox in myresistancebox
- The layout is now placed by QHBoxLayout and QVBoxLayout

Q3GroupBox->QGroupBox in mycolorbox
- remove iostream library since non-use

Q3->Q4 in helpdialog

replace popupmenu with QMenu, QAction, QMenuBar in main.cpp

remove Q3HBox, Q3Grid, and some unused library in main.cpp
Merge pull request #44 from yodalee/issue38-removeQ3inRescode

Close #38 remove Q3 in qucs-rescode