Added Slot.valueSub() test to FBE.
Added Slot.valueSub() test to FBE.

TanayParikh/foam2,TanayParikh/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm,jacksonic/vjlofvhjfgm,foam-framework/foam2,foam-framework/foam2,foam-framework/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm,TanayParikh/foam2,TanayParikh/foam2