[Changeset]: Add the comet function

[John W. Eaton]

On 21-Sep-2008, Ben Abbott wrote:

| 
| On Sep 21, 2008, at 4:49 PM, David Bateman wrote:
| 
| > Not sure how much use this function really is, but as it and comet  
| > are the only 2D core matlab plotting functions that aren't  
| > implemented, for completeness I include an implementation of this  
| > function here.
| 
| I couldn't resist the temptation to submit comet.m ;-)

I applied the changeset.

Thanks,

jwe