[changeset] behavior of sph2cart() doesn't match matlab (?)

[John W. Eaton]

On 17-Jan-2009, Ben Abbott wrote:

| New changeset attached. I noticed that I neglected to account for  
| cart2pol and pol2cart accepting 2 arguments. I've fixed that as well  
| and included additional tests.

Please commit it.  Thanks for adding the tests.

jwe