nrvec::permuteme moved from permutation.h to vec.h

vec.h

@@ -358,7 +358,14 @@ public:
 	//! permute vector elements
 	const NRVec permuted(const NRPerm<int> &p, const bool inverse=false) const;
 	void permuteme(const CyclePerm<int> &p); //in place
-	void permuteme(const NRPerm<int> &p, const bool inverse=false); //formally in place, but allocates a copy
+	void permuteme(const NRPerm<int> &p, const bool inverse=false)
+			{
+			NRVec<T> tmp=permuted(p,inverse); 
+			copyonwrite();
+			for(int i=0; i<size(); ++i) v[i] = tmp.v[i];
+			}
+
+
 
 	//! compute the sum of the absolute values of the elements of this vector 
 	inline const typename LA_traits<T>::normtype asum() const;