Now alpha construction is compiled...

	* CMakeLists.txt: Here.
Re-added gaussian support.

		 * src/Args.cc: Select it from the args.
		 * src/Args.hh: Select it from the args.
		 * src/QuadraticDataTerm.hh: Here.
		 * src/QuadraticDataTerm.hxx: Here.
		 * src/main.cc: Add to the loop.
Minor improvments.
Fix a bug (Output BV was 1 quantification step too low).

	* src/TVL0DecompositionMinimizer.hxx: Here.