Better handling of no-readline.

Fix bug where output prompts were coming *after* output values. This means that on exit/quit, we'll see something, so I added a simple 'bye' to those. Not pretty, but easier than messing with the prompt logic.

Fix bugs when readline is absent (pdb and quitting would crash badly) https://bugs.launchpad.net/ipython/+bug/495173

Fix bugs when readline is absent (pdb and quitting would crash badly) https://bugs.launchpad.net/ipython/+bug/495173

Fix debugging with breakpoints. URL: https://bugs.launchpad.net/ipython/+bug/381069

Fix debugging with breakpoints. URL: https://bugs.launchpad.net/ipython/+bug/381069

Fix auto-quoting via ',' as the first character, which had broken in refactor.

Fix quitting: now, typing bare 'exit' or 'quit' unconditionally quits. We still ask for confirmation by default with C-d (EOF), since that can happen accidentally quite easily (though users can always disble that safety if desired).

Update numpy's decorators.py from upstream.

Add new testing support machinery with better parametric tests. Also included are new tools for doctests with ipython syntax.