No more fHaveGUI

No more specific handling of GUI in bitcoin core.
Replace the last usage of fHaveGUI with a fForceServer
parameter on AppInit2.
Merge pull request #3196 from laanwj/2013_11_nohavegui

No more fHaveGUI
qt: remove unused signal from addresstablemodel
[Qt] use tr() instead of QObject::tr() in intro.cpp
[Qt] remove unused optionsmodel from addressbookpage
Merge pull request #3205 from Diapolo/intro

[Qt] use tr() instead of QObject::tr() in intro.cpp
Merge pull request #3206 from Diapolo/addressbookpage_model

[Qt] remove unused optionsmodel from addressbookpage