No more fHaveGUI

No more specific handling of GUI in bitcoin core.
Replace the last usage of fHaveGUI with a fForceServer
parameter on AppInit2.
qt: add license header to source files

Closes #839
Make time facet non-constant
Merge pull request #3197 from laanwj/2013_11_qt_license

qt: add license header to source files
Merge pull request #3198 from nvmd/compile_on_mavericks

Make time facet non-constant
Merge pull request #3196 from laanwj/2013_11_nohavegui

No more fHaveGUI
qt: remove unused signal from addresstablemodel