ipython/ipython — pull request #1893 by minrk (2012-06-10 00:10:55+00:00)
Title: Update Parallel Magics and exception drawing

Based on feedback from @fperez, a few small changes to parallel exception handling and magics:

Exception changes:

* apply_requests trigger showtraceback machinery, so apply errors are as pretty as execute ones
* InteractiveShell.showtraceback handles RemoteErrors, so it only draws the remote traceback, rather than the unhelpful local one.

Magics changes:

* removed parallelmagic extension
* creating a Client *implies* activate of a lazily-evaluated directview on all engines
* can activate Magics on multiple views with different suffixes:

```python
eall = rc.activate('all', 'all')
e0 = rc.activate(0, '0')
%pxall a=5
%px0 print a
```

* add %pxconfig magic for changing default block/targets for a collection of magics
* add targets arg to %%px cell magic
* %result renamed to %pxresult for consistency (%result kept for bw compat)
* %pxresult now only draws most recent result, but accepts all the output-formatting args of %%px
* add --out arg to %%px for storing the AsyncResult object in the user_ns

I need to do another pass on docs and tests, but I think it's mostly there.