Add interface for idx encoding not requiring intermediate tuple type.

src/namespace.c

@@ -45,6 +45,12 @@ int namespaceIdxEncode ( namespaceTuple_t tin )
   return ( tin.nsp << idxbits ) + tin.idx;
 }
 
+int namespaceIdxEncode2 ( int idx, int nsp )
+{
+  assert(nsp < NUM_NAMESPACES && idx < NUM_IDX);
+  return ( nsp << idxbits ) + idx;
+}
+
 
 namespaceTuple_t namespaceIdxDecode ( int code )
 {

src/namespace.h

@@ -8,7 +8,8 @@ typedef struct {
 
 
 void             namespaceShowbits  ( int n, char *name );
-int              namespaceIdxEncode ( namespaceTuple_t tin ); 
+int              namespaceIdxEncode ( namespaceTuple_t tin );
+int              namespaceIdxEncode2 ( int idx, int nsp );
 namespaceTuple_t namespaceIdxDecode ( int code );
 
 #endif