deprecated functions

[John W. Eaton]

On  4-Mar-2009, Jason Riedy wrote:

| Yes.  What's worse: The new diagonal matrices make sparse matrices
| dense.

This is no different from what has always happened with full x sparse
operations, as far as I can tell.  So I don't see that this could
cause any new problems for you.

| They're worse than useless to me right now.

Comments like this are not helpful.

| Working on diag&sparse ops right now, but feel free to beat me to it.

It would probably be useful to return sparse for mixed sparse and
diag matrix operations, so this would be good to have.

Thanks,

jwe