smurf: Record the number of chunks used by makemap in the output map.

The number of chunks used is now stored in new item "NCHUNK" within
the SMURF extension of the output map.

applications/smurf/libsmurf/smurf_makemap.c

@@ -746,7 +746,10 @@
 *        accessed (unless JSA tiles are being created).
 *     2014-03-31 (DSB):
 *        smf_mapbounds fast mode has been fixed so that it now works for
-#        the JSA all-sky pixel grid.
+*        the JSA all-sky pixel grid.
+*     2014-08-14 (DSB):
+*        Add NCHUNK item to the SMURF extension of the output map,
+*        holding the number of chunks used.
 *     {enter_further_changes_here}
 
 *  Copyright:
@@ -1824,6 +1827,10 @@ void smurf_makemap( int *status ) {
        ndfXpt0i( iters, ondf, SMURF__EXTNAME, "NUMITER", status );
     }
 
+    /* Store the number of chunks used in the smurf extension of the
+       output map. */
+    ndfXpt0i( (int) ncontchunks, ondf, SMURF__EXTNAME, "NCHUNK", status );
+
     /* Set bad bits mask to enable QUALITY. We can have quality bits set
        indicating where a boundary condition to zero the map has been used.
        If ast.zero_notlast is set the boundary condition was not applied on