Qt 5
Fix critical tabWidget bug
Update website URL
Merge branch 'rewrite'

Conflicts:
	configure.sh
	knotter.pro
	lib/path_builder.cpp
	src/dialogs/config_dialog.ui
	src/dialogs/export_dialog.cpp
	src/dialogs/knot_window.cpp
	src/dialogs/knot_window.hpp
	src/graphics/knotview.cpp
	src/main.cpp