LN_CORE:  Added vector-diff (equivalent to list-diff for vectors)
LN_CORE:  Added vector-diff (equivalent to list-diff for vectors)

VincentToups/lambdanative,emacstheviking/lambdanative,VincentToups/lambdanative,attila-lendvai/lambdanative,youprofit/lambdanative,emacstheviking/lambdanative,emacstheviking/lambdanative,gale320/lambdanative,attila-lendvai/lambdanative,VincentToups/lambdanative,gale320/lambdanative,attila-lendvai/lambdanative,attila-lendvai/lambdanative,youprofit/lambdanative,youprofit/lambdanative,VincentToups/lambdanative,gale320/lambdanative,gale320/lambdanative,gale320/lambdanative,emacstheviking/lambdanative,VincentToups/lambdanative,emacstheviking/lambdanative,youprofit/lambdanative,attila-lendvai/lambdanative,youprofit/lambdanative