modify debian/$foo for qt5
modify build dependencies
  - libqt4-dev (>= 4.8.0)
  + qttools5-dev (>= 5.3.0)
  + qttools5-dev-tools (>= 5.3.0)
  + quilt
simplify Qt switch
remove quilt build dependency
use master branch
conditional qt5 builds
some fixes in debian/foo
make get-orig-source more verbose
move to qt5
Merge remote-tracking branch 'origin/qt5'

Conflicts:
	debian/changelog
	debian/compat
	debian/copyright
	debian/docs
	debian/libsysstat0.install
	debian/rules
	debian/source/format
	debian/source/options
	qt4/debian/changelog
	qt4/debian/compat
	qt4/debian/control
	qt4/debian/copyright
	qt4/debian/docs
	qt4/debian/libsysstat0-dev.install
	qt4/debian/libsysstat0.install
	qt4/debian/rules
	qt4/debian/source/format
	qt4/debian/source/options
	qt5/debian/changelog
	qt5/debian/compat
	qt5/debian/copyright
	qt5/debian/docs
	qt5/debian/libsysstat-qt5-0.install
	qt5/debian/rules
	qt5/debian/source/format
	qt5/debian/source/options