[pymvpa] NiftiImage from stream or string object

[James Kyle]

Greetings,

I'm writing an application that'll receive a nifti image over a socket  
connection. Once received, it's going to pass it off to analysis  
framework.
I'm using twisted for the networking, which receives data as a Python  
string object.

As I understand the API, NiftiImage accepts either an actual file or a  
numpy array + header dict as valid arguments. I wish to avoid  
unnecessary disk I/O, so I'm going to subclass NiftiImage to accept  
raw data as an argument in the form of a string or a stream.

Before I set out to do so, I wanted to make sure I haven't missed a  
means of doing this already present in the library.

Cheers,

James Kyle