Bug Fix: datenum with Mixed Input

[John W. Eaton]

On 18-May-2008, Bill Denney wrote:

| Attached is a changeset that allows for mixed scalar and vector/matrix 
| input for datenum.  I view this as a bug fix because datenum could 
| handle mixed scalar and vector input in some variables before this, but 
| not in the month and day variables.

I applied this changeset to the default branch.  It did not apply
cleanly to the release-3-0-x branch and I don't have time to determine
why that would be, so if you think it is necessary to also fix that
branch, I could use a separate changeset for that.

Thanks,

jwe