performance hit with functions of vectors

[John W. Eaton]

On  4-Jan-2008, David Bateman wrote:

| 2008-01-04  David Bateman  <dbateman at free.fr>
| 
| 	* ov-mapper.cc (SPARSE_MAPPER_LOOP_2): Don't use the sparse elem
| 	method in the case where F(0) is non-zero, but rather use the data
| 	method directly for speed.

I applied this patch and checked it in.

Thanks,

jwe