Use new nodes for vector operations

.../com/oracle/truffle/r/ffi/impl/nodes/ListAccessNodes.java

...library/src/com/oracle/truffle/r/library/stats/Cdist.java

...ibrary/src/com/oracle/truffle/r/library/stats/Covcor.java

...ibrary/src/com/oracle/truffle/r/library/stats/Cutree.java

.../src/com/oracle/truffle/r/library/stats/DoubleCentre.java

...src/com/oracle/truffle/r/library/stats/RMultinomNode.java

...m/oracle/truffle/r/library/stats/StatsFunctionsNodes.java

...cle/truffle/r/nodes/builtin/base/ConnectionFunctions.java

.../oracle/truffle/r/nodes/builtin/base/CrossprodCommon.java

...om/oracle/truffle/r/nodes/builtin/base/GrepFunctions.java

.../com/oracle/truffle/r/nodes/builtin/base/LaFunctions.java

.../src/com/oracle/truffle/r/nodes/builtin/base/MatMult.java

...in/src/com/oracle/truffle/r/nodes/builtin/base/Merge.java

...in/src/com/oracle/truffle/r/nodes/builtin/base/Split.java

...ltin/src/com/oracle/truffle/r/nodes/builtin/base/Sum.java

...rc/com/oracle/truffle/r/nodes/builtin/base/Transpose.java

...ruffle/r/nodes/builtin/base/printer/ValuePrinterNode.java

...ruffle/r/nodes/access/vector/PositionCheckSubsetNode.java

.../truffle/r/nodes/access/vector/SearchFirstStringNode.java

...ruffle/r/nodes/attributes/SpecialAttributesFunctions.java