[PATCH 0 of 4] Implement basic sparse op diag and diag op sparse support.

[John W. Eaton]

On 12-Mar-2009, Jaroslav Hajek wrote:

| I basically agree with these changes, because their logic is
| undeniable (that was a good film :-).  I would, however, like to see
| more people say "yes" before including them for 3.2.x.

These changes only involve sparse x diag or sparse x perm matrix
operations, right?  If so, then I suppose it would be OK to include
them in 3.2.  But we do have to stop somewhere and actually make a
release (assuming, of course, that people want actual releases and not
just a long series of snapshots like we had from 1997--2007...

jwe