Add missing return that was causing double-execution of single lines.

Add experimental support for cell-based execution. For now the implementation is a bit hackish, but it does already allow pasting very complex examples such as: http://matplotlib.sourceforge.net/examples/pylab_examples/demo_agg_filter.html which before couldn't be executed. We'll need to test it further.

Fix bug where inputsplitter could enter an infinite loop.

Fix bugs with completions of paths that have ~ in them. Now %run and %cd completers should behave much better in the presence of ~ in the input string.

The CallTipWidget is now smarter about automatically hiding itself.

Added some padding between the text and the call tip to improve readability.

Fixed bug where closing a call tip by pressing Escape also cleared the input buffer.

* Moved shutdown_kernel method from FrontendWidget to KernelManager. * Moved application-specific logic for exiting from FrontendWidget to the ipythonqt application.

Implement %doctest_mode magic in zmqshell with payload. The frontend logic still needs to be written to toggle prompt displays accordingly.

Restored major default completer functionality (cd, import, run). These completers had been put in quarantine, I've done a substantial amount of cleanup and restructuring of this code and put it in core.completerlib. There's still a lot to improve there (in particular adding unittests) but at least now it's much more readable and cleanly structured. This gives us back completion for cd, import and run that 0.10 had and which we had lost since the restructuring when the code was quarantined. Also removed the ipy_stock_completers file, the loading of these completers is now done in the init_completer method.