[Image-SIG] frombuffer defaults to flip of fromstring?

[Fredrik Lundh]

> Dan Torop wrote:
> 
>> I was curious whether there was a bug in the default behavior of
>> Image.frombuffer().
> 
> sure looks like a bug.
> 
>      http://effbot.python-hosting.com/ticket/54

This is a stupid bug (*), but I'm not sure if I can just fix this 
without breaking deployed code.

My current idea is to 1) issue a warning if "frombuffer" is called with 
default arguments, and 2) fix the documentation to mention the bug and 
how to work around it in a backward- *and* forward-compatible way. 
Opinions?

</F>

*) PIL's extended test suite does careful tests on "frombuffer", 
comparing the output to that of "fromstring", but I clearly forgot
to include the default argument case in those test :-(