switch to qt5
modify debian/$foo for qt5
cleaned up build dependencies fpr qt5
conditional rules, qt5 build
typo in debian rules
new qt build
work around  https://bugreports.qt-project.org/browse/QTBUG-39859
qt5 experimental build
move to qt5
Merge remote-tracking branch 'origin/qt5'

Conflicts:
	.gitignore
	debian/changelog
	debian/compat
	debian/control
	debian/copyright
	debian/docs
	debian/patches/CMakeLists.txt.patch
	debian/patches/series
	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/libqtxdg0-dev.install
	qt4/debian/libqtxdg0.install
	qt4/debian/patches/CMakeLists.txt.patch
	qt4/debian/patches/series
	qt4/debian/rules
	qt4/debian/source/format
	qt4/debian/source/options
	qt5/debian/changelog
	qt5/debian/compat
	qt5/debian/control
	qt5/debian/copyright
	qt5/debian/docs
	qt5/debian/patches/CMakeLists.txt.patch
	qt5/debian/patches/series
	qt5/debian/rules
	qt5/debian/source/format
	qt5/debian/source/options