Imshow and Linescan - first version

[Stéfan van der Walt]

On Fri, Mar 2, 2012 at 10:11 AM, Dan Farmer <dfarmernv at gmail.com> wrote:
> I think fancy depends on what plugin you have active. try
> io.use_plugin('qt') before doing that.

We should provide a catch-all for this situation that let's the user
know what's going on, e.g. "The current I/O plugin does not have a
fancy viewer."

PRs welcome!

Stéfan