SU_vector class improvements

added SU_vector left, right * and overloaded the [] operator for
element access.
updated SU6
updated the SU_vector
more updates in SU_vector
Merge branch 'nimbustramus-local'

Conflicts:
	lib/libSQUIDS.a
	lib/libSQUIDS.dylib
	src/SQUIDS.cpp
	src/SQUIDS.o
	src/SUNalg.o
	src/const.o